參數(shù)資料
型號: HD404848FS
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機(jī)
文件頁數(shù): 61/125頁
文件大?。?/td> 471K
代理商: HD404848FS
HD404849 Series
61
T
×
(N + 1)
T
×
256
T
T
×
(256 – N)
TMC13 = 0
TMD13 = 0
The waveform is always fixed low when N = $FF.
T:
Input clock period to counter (the clock source and frequency
division ratio are controlled in timer mode registers B1, C1, and D1)
The value in timer write registers C and D
N:
TMC13 = 1
TMD13 = 1
Note:
(free-running timer setting)
256 clock cycles
256 clock cycles
Free-running timer
(1) Toggle output waveform (timers B, C, and D)
(2) PWM output waveform (timers C and D)
(256 – N)
clock cycles
(256 – N)
clock cycles
Reload timer
(reload timer setting)
Figure 43 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 prescaler division ratio as shown in figure 44. It is reset to $0 by
MCU reset.
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HD404848H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
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