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參數(shù)資料
| 型號(hào)： | HD4048412TF |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer |
| 中文描述： | 4位單片機(jī) |
| 文件頁(yè)數(shù)： | 57/125頁(yè) |
| 文件大小： | 471K |
| 代理商： | HD4048412TF |
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HD404849 Series
57
1/4
1/2
32.768-kHz
oscillator
System
clock
Prescaler W
(PSW)
Selector
Selector
Prescaler S (PSS)
S
I
Timer A interrupt
request flag
(IFTA)
Clock
Overflow
Timer
counter A
(TCA)
Timer mode
register A
(TMA)
3
2 f
1/2 tw
cyc
f
tw
cyc
PER
2
÷
4
÷
8
÷
3
÷
1
÷
5
÷
1
÷
2
÷
2
÷
8
÷
1
÷
3
÷
W
W
Figure 40 Block Diagram of Timer A
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 41.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD404848 | 4-Bit Single-Chip Microcomputer |
| HD404848FS | 4-Bit Single-Chip Microcomputer |
| HD404848H | RELAY SOCKET |
| HD404848TF | PLASTIC-GRIP |
| HD404849 | TERMINAL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404848 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404848FS | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404848H | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404848TF | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404849 | 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
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