參數(shù)資料
型號: HD404458
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): 62/120頁
文件大?。?/td> 692K
代理商: HD404458
HD404459 Series
62
T (N + 1)
T 256
T
T (256 – N)
TMC13 = 0
TMD13 = 0
The waveform is always fixed low when N = $FF.
T:
N:
The value of the timer write register (figures 55, 56, 62, and 63)
TMC13 = 1
TMD13 = 1
Input clock period to counter (figures 45, 53, and 60)
Note:
256 clock cycles
256 clock cycles
Free-running timer
Toggle output waveform (timers B, C, and D)
PWM output waveform (timers C and D)
(256 – N) clock cycles (256 – N) clock cycles
Reload timer
Figure 44 Timer Output Waveform
Registers for Timer B Operation:
By using the following registers, timer B operation modes are selected
and the timer B count is read and written.
Timer mode register B1 (TMB1: $009)
Timer mode register B2 (TMB2: $013)
Timer write register B (TWBL: $00A, TWBU: $00B)
Timer read register B (TRBL: $00A, TRBU: $00B)
Port mode register C (PMRC: $025)
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 (figure 45). It is reset to $0 by MCU
reset.
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