參數(shù)資料
型號(hào): HD404668
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計(jì)算機(jī))
中文描述: 低電壓如同在微機(jī)芯片的DTMF產(chǎn)生電路(帶雙音多頻電路的低電壓微計(jì)算機(jī))
文件頁數(shù): 56/142頁
文件大小: 894K
代理商: HD404668
HD404669 Series
56
Prescalers
The MCU has the following two prescalers, S and W.
The prescalers operating conditions are listed in table 17, and the prescalers output supply is shown in
figure 38. The timers A, C, D input clocks except external events, the serial transmit clock except the
external clock, are selected from the prescaler outputs, depending on corresponding mode registers.
Table 17 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
Clock derived by dividing
subsystem clock 32.768 kHz
oscillation by 8
MCU reset,
software
*
MCU reset,
stop mode
Note:
*
If bits TMA3 to TMA1 in timer mode register A (TMA) are all set to 1, PSW is cleared to $00.
Timer A
Timer C
Timer D
Serial
interface 1
Subsystem
clock
Prescaler W
System
clock
Clock
selector
Prescaler S
Figure 38 Prescaler Output Supply
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. 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 by
eight. After being reset to $00 by MCU reset, prescaler W divides the input clock. Prescaler W can be
reset by software.
相關(guān)PDF資料
PDF描述
HD404669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計(jì)算機(jī))
HD407A4669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計(jì)算機(jī))
HD404719FS Five timer/counters
HD404439FS Five timer/counters
HD4074719FS Five timer/counters
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404668H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD404676H 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller