參數(shù)資料
型號: M34506M4-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, MICROCONTROLLER, PDSO20
封裝: 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁數(shù): 36/114頁
文件大?。?/td> 937K
代理商: M34506M4-XXXFP
Rev.2.00
Aug 28, 2006
page 24 of 119
7643 Group
REJ03B0054-0200
TIMERS
The 7643 group has three 8-bit timers: timer 1, timer 2, and timer 3.
All timers are down count timers. When the timer reaches “0016”,
an underflow occurs at the next count pulse and the correspond-
ing timer latch is reloaded into the timer and the count is
continued. When a timer underflows, the interrupt request bit cor-
responding to that timer is set to “1”.
Fig. 19 Timer block diagram
P51/TOUT/XCOUT
Timer 1 interrupt
request
Timer 2 interrupt
request
Timer 3 interrupt
request
Timer 1 count
source select bit
“0”
“1”
φ / 8
f(XCIN) / 2
Timer 1 count
stop bit
Timer 1 latch (8)
Timer 1 (8)
Timers 1, 2 write control
bit
Timers 1, 2 write control
bit
“0”
“1”
Timer 2 count
source select bit
Timer 2 latch (8)
Timer 2 (8)
φ
TOUT output control bit
“0”
“1”
TOUT output active
edge switch bit
TOUT output
control bit
TOUT source
select bit
Q
T
Q
T
Q
T
Q
T
Q
TOUT output control bit
“0”
“1”
TOUT output active
edge switch bit
φ / 8
Timer 3 count
source select bit
Timer 3 latch (8)
Timer 3 (8)
“0”
“1”
Data bus
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