参数资料
型号: M34518E8SP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP32
封装: 8.90 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件页数: 92/162页
文件大小: 1149K
代理商: M34518E8SP
Rev.3.01
2005.06.15
page 33 of 157
REJ03B0008-0301
4518 Group
Fig. 26 Timer structure (2)
1 - - - - - - - - - - - - - - 16
Watchdog timer
INSTCK
Q
R
S
WDF1
WRST instruction
Q
R
S
WEF
DWDT instruction
+
WRST instruction
RESET signal
Q
T
D
R
RESET signal
Watchdog reset signal
PWMOUT
0
1
I22
0
1
P31/INT1
W33
T3UDF
I20
I23
I21
W31, W30
10
11
01
00
ORCLK
T2UDF
T3F
(TAB3)
(T3AB)
Timer 3 (8)
Timer 3
interrupt
Reload register R3 (8)
Register B Register A
Timer 3
underflow signal
(T3UDF)
One-sided edge
detection circuit
Both edges
detection circuit
W32
1
0
W63
0
1
I20
S
R
Q
1
0
W43
PWMOD
Q
R
D
T
W32
W61
T3UDF
Port D7 output
D7/CNTR1
Register B Register A
Reload register R4H (8)
(TAB4)
(T4AB)
Timer 4 (8)
Reload register R4L (8)
Register B Register A
Reload control circuit
W41
1
0
W40
1/2
ORCLK
XIN
“H” interval expansion
0
1
W42
T4F
R
Q
T
W43
PWMOUT
(T4HAB)
(T4R4L)
Timer 4
interrupt
(Note 4)
(TR3AB)
(Note 3)
(Note 5)
(Note 6)
TR3AB:
T4R4L:
INSTCK:
ORCLK:
This instruction is used to transfer the contents of
register A and register B to only reload register R3.
This instruction is used to transfer the contents of
reload register R4L to timer 4.
Instruction clock (system clock divided by 3)
Prescaler output (instruction clock divided by 1 to 256)
Data is set automatically from each reload
register when timer underflows
(auto-reload function).
Notes 3: XIN cannot be used for the count source when bit 1 (MR1) of
register MR is set to “1” and f(XIN) oscillation is stopped.
4: Timer 3 count start synchronous circuit is set by the valid edge
of P31/INT1 pin selected by bits 1 (I21) and 2 (I22) of register I2.
5: Flag WDF1 is cleared to “0” and the next instruction is skipped
when the WRST instruction is executed while flag WDF1 = “1”.
The next instruction is not skipped even when the WRST
instruction is executed while flag WDF1 = “0”.
6: Flag WEF is cleared to “0” and watchdog timer reset does not
occur when the DWDT instruction and WRST instruction are
executed continuously.
7: The WEF flag is set to “1” at system reset or RAM back-up
mode.
(Note 7)
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