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參數(shù)資料
| 型號： | HD404812 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
| 中文描述： | 4位單片機（4位單片微計算機） |
| 文件頁數(shù)： | 49/98頁 |
| 文件大?。?/td> | 621K |
| 代理商： | HD404812 |
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HD404818 Series
49
Timer B Operation:
Timer mode register B (TMB: $009) selects the auto-reload function, input clock
source, and prescaler divide ratio for timer B. When an external event input is used as an input clock signal
to timer B, select R3
3
/
INT
1
as
INT
1
by port mode register A (PMRA: $004) to prevent an external interrupt
request from occurring (figure 26)
Timer B is initialized according to the data written into timer load register B by software. Timer B counts
up at every clock input signal. When the next clock signal is applied to timer B after it is set to $FF, it will
generate an overflow output. In this case, if the auto-reload function is selected, timer B is initialized
according to the value of timer load register B. If it is not selected, timer B goes to $00. The timer B
interrupt request flag (IFTB: $002, bit 0) will be set as this overflow is output.
System
clock
INT
1
Selector
Prescaler S (PSS)
Clock
Timer latch
register BL
(TLBL)
Timer counter B
(TCB)
Timer load
register BU
(TLRU)
Timer load
register BL
(TLRL)
Timer mode
register B
(TMB)
Timer B interrupt
request flag
(IFTB)
3
I
2
÷
4
÷
8
÷
3
÷
1
÷
5
÷
2
÷
Free-running
control
Overflow
f
cyc
/f
SUB
(t
cyc
/t
subcyc
)
Timer latch register BU (TLBU)
Figure 26 Timer B Block Diagram
Timer C Operation:
Timer mode register C (TMC: $00D) selects the auto-reload function and the
prescaler divide ratio for timer C.
Timer C is initialized according to the data written into timer load register C by software. Timer C counts
up at every clock input signal. When the next clock signal is applied to timer C after it is set to $FF, it will
generate an overflow output. In this case, if the auto-reload function is selected, timer C is initialized
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD407L4818 | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
| HD40L4812 | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
| HD40L4816 | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
| HD40L4818 | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
| HD404816 | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404812FS | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404812H | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404812TF | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404814 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404814FS | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
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