參數(shù)資料
型號(hào)： HD404394S
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系列微電腦（4位單片微計(jì)算機(jī)）
文件頁數(shù)： 57/100頁
文件大?。?/td> 610K
代理商： HD404394S
HD404344R Series/HD404394 Series
57
Watchdog timer operation: Timer C can be used as a watchdog timer for programs that may run out of
control. A watchdog timer is enabled when the setting on the watchdog on flag (WDON: $020, bit 1) is
1. When timer C overflows, an MCU reset occurs. This usually controls programs running out of
control by initializing timer C through software before timer C counts up to $FF (figure 34).
$FF + 1
$00
Timer C
count value
Overflow
Time
CPU
operation
Normal
operation
Timer C
clear
Normal
operation
Timer C
clear
Program
runaway
Normal
operation
Reset
Figure 34 Watchdog Timer Operation Flowchart
Timer output operation: Timer C can select the timer output mode by selecting the TOC pin after setting
bit 2 (PMRA2) of port mode register A (PMRA: $004) to 1. The output of the TOC pin is initialized to
0 by an MCU reset. PWM output is a pulse output function of variable duty. The output wave differs by
the contents of timer mode register C and timer write register C, as shown in figure 35.
T (N + 1)
T 256
T
T (256 – N)
TMC3 = 0
(free-running
timer)
TMC3 = 1
(reload timer)
Notes: T: Input clock period supplied to counter. (The clock input source and system clock division ratio
are determined by timer mode register C.)
N: Value in timer write register C. (When N = 255 ($FF), PWM output is fixed low.)
Figure 35 PWM Output Waveform
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404418F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404418H 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404418S 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404439FS 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Five timer/counters
HD404439H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Five timer/counters
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