參數(shù)資料
型號(hào): HD4074449
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 58/123頁
文件大小: 726K
代理商: HD4074449
HD404449 Series
58
Registers for Timer A Operation:
Timer A operating modes are set by the following registers.
Timer mode register A (TMA: $008): Four-bit write-only register that selects timer A’s operating mode
and input clock source as shown in figure 41.
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
T
Source
2048t
cyc
1024t
cyc
512t
cyc
128t
cyc
32t
cyc
8t
cyc
4t
cyc
2t
cyc
Input clock
fr
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
D
care
Notes: 1.
2.
3.
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.
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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