參數(shù)資料
型號: HD404334FS
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer with large-capacity memory
中文描述: 4位HMCS400系列的大容量存儲器微機(jī)
文件頁數(shù): 39/78頁
文件大?。?/td> 337K
代理商: HD404334FS
HD404339 Series
39
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
2048 t
cyc
1024 t
cyc
512 t
cyc
128t
cyc
32 t
cyc
8 t
cyc
4 t
cyc
2 t
cyc
Input Clock
Frequency
0
1
1
32t
16t
8t
2t
1/2t
Time-base
mode
0
0
1
1
0
1
1
Not used
PSW and TCA reset
X
Notes:
Wcyc
Wcyc
Wcyc
Wcyc
Wcyc
X = Don’t care.
1.
2.
3.
t = 244.14
μ
s (when a 32.768-kHz crystal oscillator is used)
Timer counter overflow output period (seconds) = input clock period (seconds) 256.
The division ratio must not be modified during time-base mode operation,
otherwise an overflow cycle error will occur.
Figure 28 Timer Mode Register A (TMA)
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