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| 型號(hào)： | M34507M2-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, MICROCONTROLLER, PDSO24 |
| 封裝： | 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁(yè)數(shù)： | 62/117頁(yè) |
| 文件大?。?/td> | 937K |
| 代理商： | M34507M2-XXXFP |
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4507 Group
Rev.3.01
2005.02.04
page 47 of 111
REJ03B0107-0301
LIST OF PRECAUTIONS
Noise and latch-up prevention
Connect a capacitor on the following condition to prevent noise
and latch-up;
connect a bypass capacitor (approx. 0.1
F) between pins VDD
and VSS at the shortest distance,
equalize its wiring in width and length, and
use relatively thick wire.
In the One Time PROM version, CNVSS pin is also used as VPP
pin. Accordingly, when using this pin, connect this pin to VSS
through a resistor about 5 k
(connect this resistor to CNVSS/
VPP pin as close as possible).
Register initial values 1
The initial value of the following registers are undefined after sys-
tem is released from reset. After system is released from reset,
set initial values.
Register Z (2 bits)
Register D (3 bits)
Register E (8 bits)
Register initial values 2
The initial value of the following registers are undefined at RAM
back-up. After system is returned from RAM back-up, set initial
values.
Register Z (2 bits)
Register X (4 bits)
Register Y (4 bits)
Register D (3 bits)
Register E (8 bits)
Stack registers (SKS) and stack pointer (SP)
Stack registers (SKs) are eight identical registers, so that subrou-
tines can be nested up to 8 levels. However, one of stack
registers is used respectively when using an interrupt service
routine and when executing a table reference instruction. Accord-
ingly, be careful not to over the stack when performing these
operations together.
Prescaler
Stop the prescaler operation to change its frequency dividing ra-
tio.
Timer count source
Stop timer 1 or 2 counting to change its count source.
Reading the count value
Stop timer 1 or 2 counting and then execute the TAB1 or TAB2
instruction to read its data.
Writing to the timer
Stop timer 1 or 2 counting and then execute the T1AB or T2AB
instruction to write its data.
Writing to reload register R1
When writing data to reload register R1 while timer 1 is operat-
ing, avoid a timing when timer 1 underflows.
Watchdog timer
The watchdog timer function is valid after system is released
from reset. When not using the watchdog timer function, execute
the DWDT instruction and the WRST instruction continuously,
and clear the WEF flag to “0” to stop the watchdog timer function.
The watchdog timer function is valid after system is returned from
the RAM back-up. When not using the watchdog timer function,
execute the DWDT instruction and the WRST instruction continu-
ously every system is returned from the RAM back-up, and stop
the watchdog timer function.
Multifunction
The input/output of D2, D3, P12 and P13 can be used even when
C, K, CNTR (input) and INT are selected.
The input of P12 can be used even when CNTR (output) is selected.
The input/output of P20, P21, P30 and P31 can be used even
when AIN0, AIN1, AIN2 and AIN3 are selected.
Program counter
Make sure that the PCH does not specify after the last page of
the built-in ROM.
POF2 instruction
When the POF2 instruction is executed continuously after the
EPOF instruction, system enters the RAM back-up state.
Note that system cannot enter the RAM back-up state when ex-
ecuting only the POF2 instruction.
Be sure to disable interrupts by executing the DI instruction be-
fore executing the EPOF instruction and the POF2 instruction
continuously.
Timer 1 and timer 2 count start timing and count time when
operation starts
Count starts from the first rising edge of the count source (2) af-
ter timer 1 and timer 2 operations start (1).
Time to first underflow (3) is shorter (for up to 1 period of the
count source) than time among next underflow (4) by the timing
to start the timer and count source operations after count starts.
When selecting CNTR input as the count source of timer 2, timer
2 operates synchronizing with the falling edge of CNTR input.
Fig. 46 Timer count start timing and count time when opera-
tion starts (T1, T2)
(1) Timer
Count Source
Timer Value
Timer Underflow
Signal
3
21
032
103
2
Count Source
(CNTR input)
(2)
(3)
(4)
10
11
12
13
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34507M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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| M34508G4GP#U0 | 功能描述:MCU 2/5V 4096 QZROM PB-FREE 20-S RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:720/4500 標(biāo)準(zhǔn)包裝:300 系列:78K0R/Ix3 核心處理器:78K/0R 芯體尺寸:16-位 速度:40MHz 連通性:3 線 SIO，I²C，LIN，UART/USART 外圍設(shè)備:DMA，LVD，POR，PWM，WDT 輸入/輸出數(shù):27 程序存儲(chǔ)器容量:16KB（16K x 8） 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):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:38-SSOP 包裝:托盤 |
| M34508G4GP(#UO) | 制造商:Renesas Electronics Corporation 功能描述: |
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