參數(shù)資料
型號(hào): HD404449
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(yè)數(shù): 55/123頁(yè)
文件大?。?/td> 726K
代理商: HD404449
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HD404449 Series
55
Prescalers
The MCU has the following two prescalers, S and W.
The prescaler operating conditions are listed in table 25, and the prescaler output supply is shown in figure
39. The timer A–D input clocks except external events and the serial transmit clock except the external
clock are selected from the prescaler outputs, depending on corresponding mode registers.
Prescaler Operation
Prescaler S:
11-bit counter that inputs a system clock signal. After being reset to $000 by MCU reset,
prescaler S divides the system clock. Prescaler S keeps counting, except in stop, watch, and subactive
modes and at MCU reset.
Prescaler W:
Five-bit counter that inputs the X1 input clock signal (32-kHz crystal oscillation) divided by
eight. After being reset to $00 by MCU reset, prescaler W divides the input clock. Prescaler W can be
reset by software.
Table 25
Prescaler Operating Conditions
Prescaler
Input Clock
Reset Conditions
Stop Conditions
Prescaler S
System clock (in active
and standby mode),
Subsystem clock (in
subactive mode)
MCU reset
MCU reset, stop mode,
watch mode
Prescaler W
32-kHz crystal oscillation
Software
MCU reset, stop mode
Subsystem
clock
Prescaler W
System
clock
Prescaler S
Clock
selector
Timer A
Timer B
Timer C
Timer D
Serial 1
Serial 2
f /8
f /4 or
f /8
Figure 39 Prescaler Output Supply
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