參數(shù)資料
型號(hào): HD404369
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機(jī)
文件頁數(shù): 60/115頁
文件大?。?/td> 452K
代理商: HD404369
HD404369 Series
60
Timer mode register B1 (TMB1: $009): Four-bit write-only register that selects the free-running/reload
timer function, input clock source, and the prescaler division ratio as shown in figure 40. It is reset to $0
by MCU reset.
Writing to this register is valid from the second instruction execution cycle after the execution of the
previous timer mode register B1 write instruction. Setting timer B’s initialization by writing to timer
write register B (TWBL: $00A, TWBU: $00B) must be done after a mode change becomes valid.
When selecting the input capture timer operation, select the internal clock as the input clock source.
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
TMB12
TMB10
TMB11
Input Clock Period and Input
Clock Source
D
2
/EVNB (external event input)
TMB13
0
1
Free-Running/Reload
Timer Selection
Free-running timer
Reload timer
Figure 40 Timer Mode Register B1 (TMB1)
Timer mode register B2 (TMB2: $026): Three-bit write-only register that selects the detection edge of
signals input to pin EVNB and input capture operation as shown in figure 41. It is reset to $0 by MCU
reset.
Timer write register B (TWBL: $00A, TWBU: $00B): Write-only register consisting of the lower digit
(TWBL) and the upper digit (TWBU). The lower digit is reset to $0 by MCU reset, but the upper digit
value is invalid (figures 42 and 43).
Timer B is initialized by writing to timer write register B (TWBL: $00A, TWBU: $00B). In this case,
the lower digit (TWBL) must be written to first, but writing only to the lower digit does not change the
timer B value. Timer B is initialized to the value in timer write register B at the same time the upper
digit (TWBU) is written to. When timer write register B is written to again and if the lower digit value
needs no change, writing only to the upper digit initializes timer B.
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