參數資料
型號: HD404344R
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系列微電腦(4位單片微計算機)
文件頁數: 57/100頁
文件大?。?/td> 610K
代理商: HD404344R
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
相關PDF資料
PDF描述
HD404391S 4-bit HMCS400-series microcomputer(4位單片微計算機)
HD404392S 4-bit HMCS400-series microcomputer(4位單片微計算機)
HD404341R 4-bit HMCS400-series microcomputer(4位單片微計算機)
HD404394S 4-bit HMCS400-series microcomputer(4位單片微計算機)
HD404612 4-Bit Single-Chip Microcomputer
相關代理商/技術參數
參數描述
HD404344RFP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404344RFT 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers
HD404344RS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404344RSERIES/HD404394SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD404344S 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller