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| 型號(hào)： | M37641F8HP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 0.50 MM, PLASTIC, LQFP-80 |
| 文件頁(yè)數(shù)： | 30/385頁(yè) |
| 文件大小： | 3339K |
| 代理商： | M37641F8HP |
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Rev.2.00
Aug 28, 2006
page 108 of 113
7641 Group
REJ09B0336-0200
HARDWARE
NOTES ON PROGRAMMING
Processor Status Register
The contents of the processor status register (PS) after a reset
are undefined, except for the interrupt disable flag (I) which is “1”.
After a reset, initialize flags which affect program execution. In
particular, it is essential to initialize the index X mode (T) and the
decimal mode (D) flags because of their effect on calculations.
To reference the contents of the processor status register (PS),
execute the PHP instruction once then read the contents of
(S+1). If necessary, execute the PLP instruction to return the PS
to its original status.
A NOP instruction must be executed after every PLP instruction.
A SEI instruction must be executed before every PLP instruction.
A NOP instruction must be executed before every CLI instruction.
BRK Instruction
It can be detected that the BRK instruction interrupt event or the
least priority interrupt event by referring the stored B flag state.
Refer to the stored B flag state in the interrupt routine.
Decimal Calculations
When decimal mode is selected, the values of the V flags are in-
valid.
The carry flag (C) is set to “1” if a carry is generated as a result of
the calculation, or is cleared to “0” if a borrow is generated. To de-
termine whether a calculation has generated a carry, the C flag
must be initialized to “0” before each calculation. To check for a
borrow, the C flag must be initialized to “1” before each calcula-
tion.
Multiplication and Division Instructions
The index X mode (T) and the decimal mode (D) flags do not af-
fect the MUL and DIV instruction.
Instruction Execution Time
The instruction execution time is obtained by multiplying the fre-
quency of the internal clock
φ by the number of cycles needed to
execute an instruction.
The number of cycles required to execute an instruction is shown
in the list of machine instructions.
Timers
If a value n (between 0 and 255) is written to a timer latch, the
frequency division ratio is 1/(n+1).
P51/XCOUT/TOUT pin cannot function as an I/O port when XCIN -
XCOUT is oscillating. When XCIN - XCOUT oscillation is not used or
XCOUT oscillation drive is disabled, this pin can function as the
TOUT output pin of the timer 1 or 2.
When using the TOUT output function and f(XCIN) divided by 2 is
used as the timer 1 count source (bit 2 of T123M = “1”), disable
XCOUT oscillation drive (bit 5 of CCR = “1”).
Ports
When the data register (port latch) of an I/O port is modified with
the bit managing instruction (SEB, CLB instructions) the value of
the unspecified bit may be changed.
In standby state (the stop mode by executing the STP instruction,
and the wait mode by executing the WIT instruction) for low-
power dissipation, do not make input levels of an I/O port
“undefined”, especially for I/O ports of the P-channel and the N-
channel open-drain.
Pull-up (connect the port to Vcc) or pull-down (connect the port to
Vss) these ports through a resistor.
When determining a resistance value, note the following points:
(1) External circuit
(2) Variation of output levels during the ordinary operation
When using built-in pull-up or pull-down resistor, note on varied
current values.
(1) When setting as an input port : Fix its input level
(2) When setting as an output port : Prevent current from flowing
out to external
Serial I/O
Do not write to the serial I/O shift register during a transfer when in
SPI compatible mode.
UART
The all error flags PER, FER, OER and SER are cleared to “0”
when the UARTx status register is read, at the hardware reset or
initialization by setting the Transmit Initialization Bit. These flags
are also cleared to “0” by execution of bit test instructions such as
BBC and BCS.
The transmission interrupt request bit is set and the interrupt re-
quest is generated by setting the transmit enable bit to “1” even
when selecting timing that either of the following flags is set to “1”
as timing where the transmission interrupt is generated:
(1) Transmit buffer empty flag is set to “1”
(2) Transmit complete flag is set to “1”.
Therefore, when the transmit interrupt is used, set the transmit in-
terrupt enable bit to transmit enabled as the following sequence:
(1) Transmit enable bit is set to “1”
(2) Transmit interrupt request bit is set to “0”
(3) Transmit interrupt enable bit is set to “1”.
Do not update a value of UARTx baud rate generator in the con-
dition of transmission enabled or reception enabled. Disable
transmission and reception before updating the value. If the
former data remains in the UARTx transmit buffer registers 1 and
2 when transmission is enabled, an undefined data might be out-
put.
The receive buffer full interrupt request is not generated if receive
errors are detected at receiving.
NOTES ON PROGRAMMING
相關(guān)PDF資料 |
PDF描述 |
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| M37643F8FP | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80 |
| M37643F8HP | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80 |
| M37643M8-XXXHP | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80 |
| M37702S1LGP | 16-BIT, 8 MHz, MICROCONTROLLER, PQFP80 |
| M37702M2LXXXGP | 16-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37641F8HP#U0 | 功能描述:IC 740 MCU FLASH 32K 80LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/7600 產(chǎn)品培訓(xùn)模塊:Graphics LCD System and PIC24 Interface Asynchronous Stimulus 標(biāo)準(zhǔn)包裝:27 系列:PIC® 24H 核心處理器:PIC 芯體尺寸:16-位 速度:40 MIP 連通性:I²C，SPI，UART/USART 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，PWM，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:12KB（4K x 24） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):3 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x10b/12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 包裝:管件 產(chǎn)品目錄頁(yè)面:648 (CN2011-ZH PDF) 配用:AC164339-ND - MODULE SKT FOR PM3 28SOICDV164033-ND - KIT START EXPLORER 16 MPLAB ICD2 |
| M37641F8M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8-XXXHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641M8 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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