- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45035 > M37542M4-XXXHP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 PDF資料下載
參數(shù)資料
| 型號： | M37542M4-XXXHP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 |
| 封裝： | 6 X 6 MM, 0.50 MM PITCH, PLASTIC, WQFN-36 |
| 文件頁數(shù)： | 48/122頁 |
| 文件大?。?/td> | 1311K |
| 代理商： | M37542M4-XXXHP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁當(dāng)前第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁
7542 Group
Rev.3.03
Jul 11, 2008
Page 31 of 117
REJ03B0006-0303
Timers
The 7542 Group has 4 timers: timer 1, timer X, timer A and timer
B.
The division ratio of every timer and prescaler is 1/(n+1) provided
that the value of the timer latch or prescaler is n.
All the timers are down count timers. When a timer reaches “0”, an
underflow occurs at the next count pulse, and the corresponding
timer latch is reloaded into the timer. When a timer underflows, the
interrupt request bit corresponding to each timer is set to “1”.
Frequency divider for timer
According to the clock division selection bits (b7 and b6) of CPU
mode register (003B16), the count source of frequency divider is
set as follows;
b7b6 = “00”(high-speed), “01”(middle-speed), “11”(double-speed): XIN
b7b6 = “10”(On-chip oscillator): On-chip oscillator
●Timer 1
Timer 1 is an 8-bit timer and counts the prescaler output.
When Timer 1 underflows, the timer 1 interrupt request bit is set to
“1”.
Prescaler 1 is an 8-bit prescaler and counts the signal which is the
oscillation frequency divided by 16.
Prescaler 1 and Timer 1 have the prescaler 1 latch and the timer 1
latch to retain the reload value, respectively. The value of
prescaler 1 latch is set to Prescaler 1 when Prescaler 1
underflows. The value of timer 1 latch is set to Timer 1 when Timer
1 underflows.
When writing to Prescaler 1 (PRE1) is executed, the value is writ-
ten to both the prescaler 1 latch and Prescaler 1.
When writing to Timer 1 (T1) is executed, the value is written to
both the timer 1 latch and Timer 1.
When reading from Prescaler 1 (PRE1) and Timer 1 (T1) is ex-
ecuted, each count value is read out.
Timer 1 always operates in the timer mode.
Prescaler 1 counts the signal which is the oscillation frequency di-
vided by 16. Each time the count clock is input, the contents of
Prescaler 1 is decremented by 1. When the contents of Prescaler
1 reach “0016”, an underflow occurs at the next count clock, and
the prescaler 1 latch is reloaded into Prescaler 1 and count contin-
ues. The division ratio of Prescaler 1 is 1/(n+1) provided that the
value of Prescaler 1 is n.
The contents of Timer 1 is decremented by 1 each time the under-
flow signal of Prescaler 1 is input. When the contents of Timer 1
reach “0016”, an underflow occurs at the next count clock, and the
timer 1 latch is reloaded into Timer 1 and count continues. The di-
vision ratio of Timer 1 is 1/(m+1) provided that the value of Timer
1 is m. Accordingly, the division ratio of Prescaler 1 and Timer 1 is
1/((n+1)(m+1)) provided that the value of Prescaler 1 is n and
the value of Timer 1 is m.
Timer 1 cannot stop counting by software.
●Timer X
Timer X is an 8-bit timer and counts the prescaler X output.
When Timer X underflows, the timer X interrupt request bit is set
to “1”.
Prescaler X is an 8-bit prescaler and counts the signal selected by
the timer X count source selection bit.
Prescaler X and Timer X have the prescaler X latch and the timer
X latch to retain the reload value, respectively. The value of
prescaler X latch is set to Prescaler X when Prescaler X
underflows. The value of timer X latch is set to Timer X when
Timer X underflows.
When writing to Prescaler X (PREX) is executed, the value is writ-
ten to both the prescaler X latch and Prescaler X.
When writing to Timer X (TX) is executed, the value is written to
both the timer X latch and Timer X.
When reading from Prescaler X (PREX) and Timer X (TX) is ex-
ecuted, each count value is read out.
Timer X can be selected in one of 4 operating modes by setting
the timer X operating mode bits of the timer X mode register.
(1) Timer mode
Prescaler X counts the count source selected by the timer X count
source selection bits. Each time the count clock is input, the con-
tents of Prescaler X is decremented by 1. When the contents of
Prescaler X reach “0016”, an underflow occurs at the next count
clock, and the prescaler X latch is reloaded into Prescaler X and
count continues. The division ratio of Prescaler X is 1/(n+1) pro-
vided that the value of Prescaler X is n.
The contents of Timer X is decremented by 1 each time the under-
flow signal of Prescaler X is input. When the contents of Timer X
reach “0016”, an underflow occurs at the next count clock, and the
timer X latch is reloaded into Timer X and count continues. The di-
vision ratio of Timer X is 1/(m+1) provided that the value of Timer
X is m. Accordingly, the division ratio of Prescaler X and Timer X is
1/((n+1)(m+1)) provided that the value of Prescaler X is n and
the value of Timer X is m.
(2) Pulse output mode
In the pulse output mode, the waveform whose polarity is inverted
each time timer X underflows is output from the CNTR0 pin.
The output level of CNTR0 pin can be selected by the CNTR0 ac-
tive edge switch bit. When the CNTR0 active edge switch bit is “0”,
the output of CNTR0 pin is started at “H” level. When this bit is “1”,
the output is started at “L” level.
Also, the inverted waveform of pulse output from CNTR0 pin can
be output from TXOUT pin by setting “1” to the P03/TXOUT output
valid bit.
When using a timer in this mode, set the port P14 and P03 direc-
tion registers to output mode.
(3) Event counter mode
The timer A counts signals input from the P14/CNTR0 pin.
Except for this, the operation in event counter mode is the same
as in timer mode.
The active edge of CNTR0 pin input signal can be selected from
rising or falling by the CNTR0 active edge switch bit .
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37542M2-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO36 |
| M37542M2-XXXHP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 |
| M37542M2-XXXGP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542F4SP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37542F8HP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQCC36 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37542M4-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542RSS | 功能描述:DEV EMULATION EVA CHIP FOR M3754 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關(guān)產(chǎn)品:1-Wire? 設(shè)備 產(chǎn)品目錄頁面:1429 (CN2011-ZH PDF) |
| M37544 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37544G2AGP | 制造商:Renesas Electronics Corporation 功能描述:MCU 8BIT 740 CISC 8KB ROM 5V 32LQFP - Trays |
| M37544G2AGP#U0 | 功能描述:IC 740 MCU OTP 8K 32LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 產(chǎn)品培訓(xùn)模塊:MCU Product Line Introduction AVR® UC3 Introduction 標(biāo)準(zhǔn)包裝:2,500 系列:AVR®32 UC3 B 核心處理器:AVR 芯體尺寸:32-位 速度:60MHz 連通性:I²C，IrDA，SPI，SSC，UART/USART，USB 外圍設(shè)備:欠壓檢測/復(fù)位，DMA，POR，PWM，WDT 輸入/輸出數(shù):28 程序存儲器容量:128KB（128K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:32K x 8 電壓 - 電源 (Vcc/Vdd):1.65 V ~ 1.95 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TQFP 包裝:帶卷 (TR) 配用:ATSTK600-TQFP48-ND - STK600 SOCKET/ADAPTER 48-TQFPATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMRATEVK1101-ND - KIT DEV/EVAL FOR AVR32 AT32UC3B 其它名稱:AT32UC3B1128-AUR-NDAT32UC3B1128-AURTR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。