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參數(shù)資料
| 型號(hào)： | HD404389 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī)) |
| 中文描述： | 低電壓如同在微機(jī)芯片的A / D轉(zhuǎn)換器（帶片上的A / D轉(zhuǎn)換器的低壓微計(jì)算機(jī)） |
| 文件頁(yè)數(shù)： | 68/162頁(yè) |
| 文件大?。?/td> | 482K |
| 代理商： | HD404389 |
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HD404374/HD404384/HD404389/HD404082/HD404084 Series
68
Prescalers
The MCU has the following prescalers, S and W (HD404374 Series).
The operating conditions for each prescaler are shown in table 24, and the output supply destinations in
figure 31.
Timer A to C input clocks other than external events, and serial transfer clocks other than external clocks
are selected from the prescaler outputs in accordance with the respective mode register.
Prescaler Operation
Prescaler S (PSS):
Prescaler S is an 11-bit counter that has the system clock as input. When the MCU is reset, prescaler S is
reset to $000, then divides the system clock. Prescaler S operation is stopped by a reset by the MCU, and
in stop mode and watch mode
*1
. It does not stop in any other modes.
Prescaler W (PSW) (HD404374 Series):
Prescaler W is a counter that has a clock divided from the X1 input (32 kHz crystal oscillation) as input.
When the MCU is reset, prescaler W is reset to $00, then divides the input clock. Prescaler W can also be
reset by software.
Table 24
Prescaler Operating Conditions
Prescaler
Input Clock
Reset Conditions
Stop Conditions
Prescaler S
System clock in active and
standby modes, subsystem
clock in subactive mode*
1
MCU reset, stop mode
clearance
MCU reset, stop mode,
watch mode*
1
Prescaler W
Clock obtained by division-
by-8 of 32.768 kHz
oscillation by subsystem
clock oscillator
Applies to HD404374 Series
If bits TMA3 to TMA1 in timer mode register A (TMA) are all set to 1, PSW is cleared to $00.
MCU reset, software*
2
MCU reset, stop mode
Notes: 1
2
相關(guān)PDF資料 |
PDF描述 |
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| HD404081 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī)) |
| HD407A4374 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī)) |
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| HD407A4389 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī)) |
| HD407C4374 | Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī)) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404389FT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404391 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers |
| HD404391FP | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers |
| HD404391FT | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers |
| HD404391S | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers |
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