參數(shù)資料
型號: HD404358
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機
文件頁數(shù): 42/100頁
文件大?。?/td> 398K
代理商: HD404358
HD404358 Series
42
Prescalers
The MCU has a built-in prescaler labeled as prescaler S (PSS).
The prescalers operating conditions are listed in table 24, and the prescalers output supply is shown in
figure 28. The timers A–C input clocks except external events, 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 the system clock signal. After being reset to $000 by MCU reset,
prescaler S divides the system clock.
Table 24
Prescaler Operating Conditions
Prescaler
Input Clock
Reset Conditions
Stop Conditions
Prescaler S
System clock
MCU reset
MCU reset, stop mode
Timer A
Timer B
Timer C
Serial
System
clock
Prescaler S
Clock
selector
Alarm output
circuit
Figure 28 Prescaler Output Supply
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