參數(shù)資料
型號： HCD40C4344R
廠商： Hitachi,Ltd.
英文描述： 4-bit HMCS400-series microcomputer(4位單片微計算機)
中文描述： 4位HMCS400系列微電腦（4位單片微計算機）
文件頁數(shù)： 52/100頁
文件大?。?/td> 610K
代理商： HCD40C4344R
HD404344R Series/HD404394 Series
52
Using Timer B Registers
Timer B sets the operation and the read/write data according to the following registers.
Timer mode register B1 (TMB1: $009)
Timer mode register B2 (TMB2: $026)
Timer write register B
(TWBL: $00A, TWBU: $00B)
Timer read register B
(TRBL: $00A, TRBU: $00B)
Port mode register B (PMRB: $024)
Timer mode register B1 (TMB1: $009): Four-bit write-only register that selects the free-running/reload
timer, input clock, and prescaler division ratio, as shown in figure 27. It is reset to $0 by an MCU reset.
Data written to timer mode register B1 is valid after two instruction cycles. The initial setting of timer
B, which is set by writing to timer write register B (TWBL: $00A, TWBU: $00B), should be
programmed only after a mode change has been effective.
Bit
Initial value
Read/Write
Bit name
3
0
W
TMB13
2
0
W
TMB12
0
0
W
TMB10
1
0
W
TMB11
Timer mode register B1 (TMB1: $009)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2048t
cyc
512t
cyc
128t
cyc
32t
cyc
8t
cyc
4t
cyc
2t
cyc
D
0
/
INT
0
/EVNB (external event
input)
TMB12
TM
TMB11
Input Clock Period and Input
TMB13
0
1
Free-Running/Reload
Timer Selection
Free-running timer
Reload timer
Figure 27 Timer Mode Register B1 (TMB1)
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