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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： | 15/64页 |
| 文件大小： | 331K |
| 代理商： | EM73MA89B |
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22
* This specification are subject to be changed without notice.
10.15.2002 (V1.3)
EM73MA89B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
Internal pulse
TimerB(TimerA) value
n
n+1
n+2
n+3
n+4
n+5
P8.1/TRGB(P8.3/TRGA)
PROGRAM EXAMPLE: To generate TRGA interrupt request after 60 ms with system clock LXlN=32KHz
LDIA
#0100B
;
EXAE
; enable mask 2
EICIL
110111b
; interrupt latch
←0, enable EI
LDIA
#0Ah;
STATAL;
LDIA
#00h;
STATAM;
LDIA
#0Fh;
STATAH;
LDIA
#1000B;
OUTA
P28
; enable timerA with internal pulse rate: LXIN/23 Hz
NOTE:
The preset value of timer/counter register is calculated as following procedure.
Internal pulse rate: LXIN/23 ; LXIN = 32KHz
The time of timer counter count one = 23 /LXIN = 8/32768=0.244ms
The number of internal pulse to get timer overflow = 60 ms/0.244ms = 245.901= 0F6h
The preset value of timer/counter register = 1000h - 0F6h = F0Ah
PULSE WIDTH MEASUREMENT MODE
Under the pulse width measurement mode, the counter is incresed at the rising edge of internal pulse during
external timer/counter input (P8.1/TRGB, P8.3/TRGA) in high level, interrupt request is generated as soon as
timer/counter count overflow.
PROGRAM EXAMPLE: Enable timerA by pulse width measurement mode.
LDIA
#1100b ;
OUTA
P28
; Enable timerA with pulse width measurement mode.
TIMER MODE
Under timer mode, the timer/counter is increased by one at any rising edge of internal pulse. User can choose
up to 4 types of internal pulse rate by setting IPSB for timerB (IPSA for timerA).
When timer/counter counts overflow, an interrupt request will be sent to interrupt control unit.
Internal pulse
TimerB (TimerA )value
n
n+1
n+2
n+3
n+4
n+5
n+6
n+7
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