參數(shù)資料
型號(hào)： M37221M6-079SP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
中文描述： 單芯片8位CMOS微機(jī)電壓合成
文件頁(yè)數(shù)： 12/61頁(yè)
文件大小： 1386K
代理商： M37221M6-079SP
MITSUBISHI MICROCOMPUTERS
M37221M6-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
12
TIMERS
The M37221M6-XXXSP has 4 timers: timer 1, timer 2, timer 3, and
timer 4. All timers are 8-bit timers with the 8-bit timer latch. The timer
block diagram is shown in Figure 7.
All of the timers count down and their divide ratio is 1/(n+1), where n
is the value of timer latch. The value is set to a timer at the same time
by writing a count value to the corresponding timer latch (addresses
00F0
16
to 00F3
16
).
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
”.
(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 the timer 12
mode register (address 00F4
16
).
Timer 1 interrupt request occurs at timer 1 overflow.
(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 P2
4
/TIM2 pin
The count source of timer 2 is selected by setting bits 4 and 1 of the
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.
(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 P2
3
/TIM3 pin
The count source of timer 3 is selected by setting bits 5 and 0 of the
timer 34 mode register (address 00F5
16
)
Timer 3 interrupt request occurs at timer 3 overflow.
(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 4 and 1 of the
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 at these state, 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 bit 0 of the timer 34 mode register (address 00F5
16
) to “0”
before the 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 at these state, the internal clock is connected.
Because of this, the program starts with the stable clock.
The structure of timer-related registers is shown in Figure 6.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37221M6-286SP 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
M37221M6H 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
M37221M6H-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
M37221M6H-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
M37221M6-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
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