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參數(shù)資料
| 型號： | HD40A46612 |
| 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算機(jī)） |
| 文件頁數(shù)： | 58/142頁 |
| 文件大小： | 894K |
| 代理商： | HD40A46612 |
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HD404669 Series
58
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
Data bus
Clock line
Signal line
Figure 39 Block Diagram of Timer A
Timer A Operations
Free-running timer operation:
The timer A input clock is selected by timer mode register A (TMA:
$008). Timer A is reset to $00 by an MCU reset, and counts up each time the input clock is input. When
the input clock is input after the timer A value reaches $FF, overflow output is generated, and the timer A
value becomes $00. The generated overflow output sets the timer A interrupt request flag (IFTA: $001, 2).
Timer A continues counting up after the count value returns to $00, so that an interrupt is generated
regularly every 256 input clock cycles.
Realtime clock time base operation:
Timer A can be used as the realtime clock time base by setting bit 3
(TMA3) of timer mode register A to 1. As the prescaler W output is input to timer counter A (TCA),
interrupts are generated with accurate timing using the 32.768 kHz crystal oscillator as the basic
clock.When timer A is used as the realtime clock time base, prescaler W and timer counter A (TCA) can be
reset to $00 by the program.
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 40.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD40A4668 | Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(jī)) |
| HD40A4669 | Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(jī)) |
| HD404668 | Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(jī)) |
| HD404669 | Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(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算機(jī)) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD40A46612H | 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 |
| HD40A4668 | 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 |
| HD40A4668H | 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 |
| HD40A4669 | 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 |
| HD40A4669H | 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 |
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