參數(shù)資料
型號: HD404364
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系列微機(4位單片微計算機)
文件頁數(shù): 66/115頁
文件大小: 710K
代理商: HD404364
HD404369 Series
66
T (N + 1)
T 256
T
T (256 – N)
TMC3 = 0
(free-running
timer)
TMC3 = 1
(reload timer)
Notes: T: Input clock period supplied to counter. (The clock source and system clock division ratio are
determined by timer mode register C.)
N: Value of timer write register C. (When N = 255 ($FF), PWM output is fixed low.)
Figure 49 PWM Output Waveform
Registers for Timer C Operation:
By using the following registers, timer C operation modes are selected
and the timer C count is read and written.
Timer mode register C (TMC: $00D)
Port mode register A (PMRA: $004)
Timer write register C (TWCL: $00E, TWCU: $00F)
Timer read register C (TRCL: $00E, TRCU: $00F)
Timer mode register C (TMC: $00D): 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 50. 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 C write instruction. Setting timer C’s initialization by writing to timer
write register C (TWCL: $00E, TWCU: $00F) must be done after a mode change becomes valid.
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