參數(shù)資料
型號(hào): HD404849H
廠商: Hitachi,Ltd.
英文描述: SPLICE
中文描述: 4位單片機(jī)
文件頁數(shù): 58/125頁
文件大小: 471K
代理商: HD404849H
HD404849 Series
58
Bit
Initial value
Read/Write
Bit name
3
0
W
TMA3
2
0
W
TMA2
0
0
W
TMA0
1
0
W
TMA1
Timer mode register A (TMA: $008)
0
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSW
PSW
PSW
PSW
PSW
Operating mode
Timer A mode
TMA3
TMA1
TMA2
TMA0
Source
prescaler
2048t
cyc
1024t
cyc
512t
cyc
128t
cyc
32t
cyc
8t
cyc
4t
cyc
2t
cyc
Input clock
frequency
0
1
1
32t
Wcyc
16t
Wcyc
8t
Wcyc
2t
Wcyc
1/2t
Wcyc
Time-base
mode
0
0
1
1
0
1
1
Inhibited
PSW and TCA reset
Don’t
care
Note: 1.
2.
3.
4.
t
Wcyc
= 244.14
μ
s (when a 32.768-kHz crystal oscillator is used)
Timer counter overflow output period (seconds) = input clock period (seconds) 256.
If PSW or TCA reset is selected while the LCD is operating, LCD operation halts
(power switch goes off and all SEG and COM pins are grounded).
When an LCD is connected for display, the PSW and TCA reset periods must be
set in the program to the minimum.
The division ratio must not be modified during time-base mode operation,
otherwise an overflow cycle error will occur.
×
Figure 41 Timer Mode Register A (TMA)
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