參數(shù)資料
型號(hào): HD4074459
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))
文件頁數(shù): 56/120頁
文件大小: 692K
代理商: HD4074459
HD404459 Series
56
Prescalers
The MCU has two prescalers, S and W. See table 25 and figure 40.
Both the timers 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.
32-kHz
crystal
oscillator
System
clock
Prescaler W
Prescaler S
Timer A
Timer B
Timer C
Timer D
Serial
Clock
selector
f
X
/8
f
X
/4 or f
X
/8
Figure 40 Prescaler Output Supply
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 watch and stop modes and at
MCU reset.
Prescaler W:
Five-bit counter that inputs the X1 input clock signal (32-kHz crystal oscillation) divided.
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
Prescaler S
Input Clock
System clock
(in active and standby
mode),
Subsystem clock
(in subactive mode)
32-kHz crystal oscillation
Reset Conditions
MCU reset
Stop Conditions
MCU reset,
stop mode,
watch mode
Prescaler W
MCU reset, software
MCU reset,
stop mode
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