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参数资料
| 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： | 22/64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)
Auto load timer mode
In this mode, there are four different internal pulse rates can be selected by P20. The HTC loads the
initial values by the counter registers (P12, P13) and increases at the rising edges of internal pulse generated
by the time base. The value of TCB increases one when the high speed counter overflows and generates
an overflow interrupt (TRGB) when the TCB overflows. This mode is only available for DUAL operation
mode.
PROGRAM EXAMPLE :
LDIA
#00H
; initial TCB & HTC register
STATBL
STATBM
STATBH
OUTA
P13
OUTA
P12
OUTA
P18
LDIA
#0111B
; enable timer mode, internal pulse rate : CLK/27
OUTA
P20
:
LDIA
#00H
; disable timer mode
OUTA
P20
INA
P12
; store the counter value to RAM[00] - RAM[04]
STA
00H
INA
P13
STA
01H
LDATBL
STA
02H
LDATBM
STA
03H
LDATBH
STA
04H
Melody mode
In the melody mode, HTC will output the square wave to the PWM circuit or D/A converter.
The 8-bit tone frequency register is P13 and P12. The tone frequency will be changed when users output
the different data to P12. Thus, the data must be output to P13 before P12 when users want to change
the 8-bit tone frequency (TF). This mode is only available for DUAL operation mode.
P13
P12
3
2
1
0
3
2
1
0
Initial value : 0000 0000 ( TF )
Higher nibble register
Lower nibble register
** F
TONE = [ (CLK / 2
X) / (100H - TF) ] / 2, TF = 0 ~ 255
** Example : CLK = 4.6MHz, RATE = 01, TF = 11001110 B= 0CEH.
F
TONE = [ (4.6MHz / 2
5) / (100H - 0CEH) ] / 2 = 1430 Hz.
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