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參數(shù)資料
| 型號： | M37212EFSP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機(jī)) |
| 中文描述： | 單芯片8位單片機(jī)（8位單片機(jī)） |
| 文件頁數(shù)： | 24/119頁 |
| 文件大?。?/td> | 1308K |
| 代理商： | M37212EFSP |
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24
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
M37212EFSP/FP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
8.4 TIMERS
This microcomputer has 4 timers: timers 1 to 4. All timers are 8-bit
timers with the 8-bit timer latch. The timer block diagram is shown in
Figure 8.4.3.
All of the timers count down and their divide ratio is 1/(n+1), where n
is the value of timer latch. By writing a count value to the correspond-
ing timer latch (addresses 00F0
16
to 00F3
16
: timers 1 to 4), the value
is also set to a timer, simultaneously.
The count value is decremented by 1. The timer interrupt request bit
is set to “1” by a timer overflow at the next count pulse, after the
count value reaches “00
16
.”
8.4.1 Timer 1
Timer 1 can select one of the following count sources:
f(X
IN
)/16
f(X
IN
)/4096
The count source of timer 1 is selected by setting bit 0 of timer 12
mode register 1 (address 00F4
16
).
Timer interrupt request occurs at timer 1 overflow.
8.4.2 Timer 2
Timer 2 can select one of the following count sources:
f(X
IN
)/16
Timer 1 overflow signal
External clock from the TIM2 pin
The count source of timer 2 is selected by setting bits 4 and 1 of
timer 12 mode register (address 00F4
16
). When timer 1 overflow
signal is a count source for the timer 2, the timer 1 functions as an 8-
bit prescaler.
Timer 2 interrupt request occurs at timer 2 overflow.
8.4.3 Timer 3
Timer 3 can select one of the following count sources:
f(X
IN
)/16
External clock from the H
SYNC
pin
External clock from the TIM3 pin
The count source of timer 3 is selected by setting bits 5 and 0 of
timer 34 mode register (address 00F5
16
).
Timer 3 interrupt request occurs at timer 3 overflow.
8.4.4 Timer 4
Timer 4 can select one of the following count sources:
f(X
IN
)/16
f(X
IN
)/2
Timer 3 overflow signal
The count source of timer 3 is selected by setting bits 1 and 4 of
timer 34 mode register (address 00F5
16
). When timer 3 overflow
signal is a count source for the timer 4, the timer 3 functions as an 8-
bit prescaler.
Timer 4 interrupt request occurs at timer 4 overflow.
At reset, timers 3 and 4 are connected by hardware and “FF
16
” is
automatically set in timer 3; “07
16
” in timer 4. The f(X
IN
)/16 is se-
lected as the timer 3 count source. The internal reset is released by
timer 4 overflow in this state and the internal clock is connected.
At execution of the STP instruction, timers 3 and 4 are connected by
hardware and “FF
16
” is automatically set in timer 3; “07
16
” in timer 4.
However, the f(X
IN
)/16 is not selected as the timer 3 count source.
So set both bit 0 of timer 34 mode register (address 00F5
16
) and bit
6 at address 00C7
16
to “0” before execution of the STP instruction
(f(X
IN
)/16 is selected as the timer 3 count source). The internal STP
state is released by timer 4 overflow in this state and the internal
clock is connected.
As a result of the above procedure, the program can start under a
stable clock.
The timer-related registers is shown in Figures 8.4.1 and 8.4.2.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37212M4-XXXSP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER |
| M37212M8-XXXSP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER |
| M37221M6-054SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER |
| M37221M6-079SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37212EFSP/FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER |
| M37212M4 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37212M4-054SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37212M4-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37212M6-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
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