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參數(shù)資料
| 型號： | HD404618H |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer |
| 中文描述： | 4位單片機 |
| 文件頁數(shù)： | 45/89頁 |
| 文件大?。?/td> | 358K |
| 代理商： | HD404618H |
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HD404618 Series
45
System
clock
INT
1
Selector
Prescaler S (PSS)
Clock
Timer counter register BU (TCBU)
Timer counter
register BL
(TCBL)
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)
f
cyc
/f
SUB
(t
cyc
/t
subcyc
)
3
I
2
÷
4
÷
8
÷
3
÷
1
÷
5
÷
2
÷
Free-running
control
Overflow
Figure 27 Timer B Block Diagram
Timer C (TCCL and TCRL: $00E, TCCU and TCRU: $00F):
Eight-bit write-only timer load register
(TCRL and TCRU) and read-only timer counter (TCCL and TCCU) located at the same addresses. The
eight-bit configuration consists of lower and upper 4-bit digits located at sequential addresses. The
operation of timer C is basically the same as that of timer B.
The auto-reload function and prescaler division ratio of timer C depend on the state of timer mode register
C (TMC). Timer C is initialized to the value set in TMC by software, and is then incremented by one at
each clock input. If an input is applied to timer C after it has reached $FF, an overflow is generated. In
this case, if the auto-reload function is enabled, timer C is initialized to its initial value; if auto-reload is
disabled, the timer is initialized to $00. The overflow sets the timer C interrupt request flag (IFTC: $002,
bit 2).
Timer C also functions as a watchdog timer. If a program routine runs out of control and an overflow is
generated while the watchdog on (WDON) flag is set, the MCU is reset. This error can be detected by
having the program control timer C reset before timer C reaches $FF.
The WDON can only have 1 written to it ; it is cleared to 0 only by MCU reset.
Timer Mode Register A (TMA: $008):
Four-bit write-only register that controls timer A as shown in
table 21.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD404618TF | 4-Bit Single-Chip Microcomputer |
| HD4074618 | 4-Bit Single-Chip Microcomputer |
| HD4074618FS | CONNECTOR |
| HD4074618H | 4-Bit Single-Chip Microcomputer |
| HD4074618TF | 4-Bit Single-Chip Microcomputer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404618SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD404618TF | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD4046212FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD4046212H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD4046212R | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a DTMF Generator Circuit |
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