參數(shù)資料
型號: M34571G4
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機的CMOS
文件頁數(shù): 29/126頁
文件大?。?/td> 1627K
代理商: M34571G4
Rev.1.02
REJ03B0179-0102
May 25, 2007
Page 29 of 124
4571 Group
Fig 32. Timers structure (2)
Watchdog reset
signal
reset signal
(Note 3)
D
T
Q
R
DWDT instruction
+
WRST instruction
Reset signal
(Note 4)
(Note 2)
WRST instruction
Watchdog timer (16)
1 - - - - - - - - - - - - - 16
INSTCK
S
R
Q
WDF1
S
R
Q
WEF
C/CNTR
1
Port C output
PWMOUT
PWMOD
W1
2
W5
1
Q
R
D
T
T1UDF
W3
0
0
1
X
IN
W3
1
Timer 3 (8)
Reload Register R3L (8)
(T3AB)
(T3AB)
Register B
(TAB3)
Register A
(T3AB)
(TAB3)
(T3R3L)
Reload control circuit
(Note 1)
Reload Register R3H (8)
(T3HAB)
Register B
Register A
W3
3
Timer 3
interrupt
1/2
ORCLK
T
Q
R
W3
2
1
0
“H” interval expansion
T3F
PWMOD
T2UDF: Timer 2 underflow signal
ORCLK: Prescaler output
Note 1: When the CNTR1 output function is valid (W3
3
=“1”), the value is auto-reloaded alternately from reload register
R3L and R3H every timer 3 underflow.
When the CNTR1 function is invalid (W3
3
=“0”), the value is auto-reloaded from reload register R3L only.
2: Flag WDF1 is cleared to “0” and the next instruction is skipped when the WRST instruction is executed
while flag WDF1 = “1”.
The WRST instruction is equivalent to the NOP instruction while flag WDF1 = “0”.
3: Flag WEF is cleared to “0” and watchdog timer reset does not occur when the DWDT instruction and
WRST instruction are executed continuously.
4: The WEF flag is set to “1” at system reset or RAM back-up mode.
Data is set automatically from each reload register
when timer underflows (auto-reload function).
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