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| 型号： | EM73MA89B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-EPSOIC T&R |
| 中文描述： | 4，液晶产品位微控制器 |
| 文件页数： | 14/64页 |
| 文件大小： | 331K |
| 代理商： | EM73MA89B |
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* This specification are subject to be changed without notice.
EM73MA89B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
10.15.2002 (V1.3)
TIMER/COUNTER CONTROL
P8.1/TRGB, P8.3/TRGA are the external timer inputs for timerB and timerA, they are used in event
counter and pulse-width measurement mode.
Timer/counter command port: P28 is the command port for timer/counterA and P29 is for the timer/
counterB.
P28, P29
3210
Initial value : 0000
TMSA(B) IPSA(B)
TMSA(B) Mode selection
0 0
Stop
0 1
Event counter mode
1 0
Timer mode
1 1
Pulse width measurement mode
IPSA
Clock rate selection
IPSB
Clock rate selection
NORMAL mode SLOW mode
0 0
LXIN/23 HZ
Reserved
0 0
Depend on high speed timer/counter
0 1
LXIN/27 HZ
0 1
LXIN/25 HZ
1 0
LXIN/211 HZ
1 0
LXIN/29 HZ
1 1
LXIN/215 HZ
1 1
LXIN/213 HZ
TIMER/COUNTER FUNCTION
Timer/counterA,B are programmable for timer, event counter and pulse width measurement mode. Each
timer/counter can execute any of these functions independently.
EVENT COUNTER MODE
Under event counter mode, the timer/counter is increased by one at any rising edge of P8.1/TRGB for timerB
(P8.3/TRGA for timer A). When timerB (timerA) counts overflow, it will provide an interrupt request
TRGB (TRGA) to interrupt control unit.
PROGRAM EXAMPLE: Enable timerA with P28
LDIA
#0100b;
OUTA
P28
; Enable timerA with event counter mode
P8.1/TRGB (P8.3/TRGA)
TimerB (TimerA) value n
n+1
n+2
n+3
n+4
n+5
n+6
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