參數資料
型號: HD404618H
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機
文件頁數: 48/89頁
文件大?。?/td> 358K
代理商: HD404618H
HD404618 Series
48
T (TCR + 1)
T 256
T
T (256 – TCR)
TMC3 = 0
Period of clock input to the counter (table 23)
Value of timer load register C (0–255)
Note: This waveform is always fixed low
when TCR = $FF.
TMC3 = 1
T:
TCR:
Figure 29 Variable-Duty Pulse Output Waveform
Timer Mode Register B (TMB: $009):
Four-bit write-only register that selects the auto-reload function,
the prescaler division ratio, and input clock source as shown in table 22. Timer mode register B is
initialized to $0 by MCU reset.
Writing to this register is valid from the second instruction execution cycle. Timer B initialization set by
writing to TMB must be done after a mode change becomes valid.
Table 22 Timer Mode Register B
TMB
Bit 3
Auto-Reload Function
0
Disabled
1
Enabled
TMB
Bit 2
Bit 1
Bit 0
Prescaler Division Ratio, Clock Input Source
0
0
0
÷
2048
÷
512
÷
128
÷
32
÷
8
÷
4
÷
2
INT
1
(external event input)
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
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