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參數(shù)資料
| 型號(hào)： | HD407A4369 |
| 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)： | 54/115頁 |
| 文件大?。?/td> | 710K |
| 代理商： | HD407A4369 |
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HD404369 Series
54
Timers
The MCU has four timer/counters (A to C).
Timer A: Free-running timer
Timer B: Multifunction timer
Timer C: Multifunction timer
Timer A is an 8-bit free-running timer. Timers B and C are 8-bit multifunction timers, whose functions are
listed in table 25. The operating modes are selected by software.
Timer A
Timer A Functions:
Timer A has the following functions.
Free-running timer
Clock time-base
The block diagram of timer A is shown in figure 36.
Timer A Operations:
Free-running timer operation: The input clock for timer A is selected by timer mode register A (TMA:
$008).
Timer A is reset to $00 by MCU reset and incremented at each input clock. If an input clock is applied
to timer A after it has reached $FF, an overflow is generated, and timer A is reset to $00. The overflow
sets the timer A interrupt request flag (IFTA: $001, bit 2). Timer A continues to be incremented after
reset to $00, and therefore it generates regular interrupts every 256 clocks.
Clock time-base operation: Timer A is used as a clock time-base by setting bit 3 (TMA3) of timer mode
register A (TMA: $008) to 1. The prescaler W output is applied to timer A, and timer A generates
interrupts at the correct timing based on the 32.768-kHz crystal oscillation. In this case, prescaler W and
timer A can be reset to $00 by software.
Registers for Timer A Operation:
Timer A operating modes are set by the following registers.
Timer mode register A (TMA: $008): Four-bit write-only register that selects timer A’s operating mode
and input clock source as shown in figure 37.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD4043612 | 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī)) |
| HD404369 | 4-bit HMCS400-Series microcomputer |
| HD404369H | 4-bit HMCS400-Series microcomputer |
| HD404369S | 4-bit HMCS400-Series microcomputer |
| HD404369F | 4-bit HMCS400-Series microcomputer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD407A4369F | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit HMCS400-Series microcomputer |
| HD407A4369H | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:microcomputer has an A/D converter |
| HD407A4369S | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:microcomputer has an A/D converter |
| HD407A4374 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip A/D Converter |
| HD407A4374FT | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip A/D Converter |
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