參數(shù)資料
型號(hào)： M37212M8
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(yè)數(shù)： 74/119頁(yè)
文件大?。?/td> 1308K
代理商： M37212M8
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74
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
8.13 CLOCK GENERATING CIRCUIT
The built-in clock generating circuit is shown in Figure 8.13.3. When
the STP instruction is executed, the internal clock
φ
stops at HIGH.
At the same time, timers 3 and 4 are connected by hardware and
“FF
16
” is set in timer 3 and “07
16
” is set in the timer 4. Select f(X
IN
)/16
as the timer 3 count source (set bit 0 of the timer mode register 2 to
“0” before the execution of the STP instruction). Moreover, set the
timer 3 and timer 4 interrupt enable bits to disabled (“0”) before ex-
ecution of the STP instruction). The oscillator restarts when external
interrupt is accepted. However, the internal clock
φ
keeps its HIGH
until timer 4 overflows, allowing time for oscillation stabilization when
a ceramic resonator or a quartz-crystal oscillator is used.
When the WIT instruction is executed, the internal clock
φ
stops in
the HIGH but the oscillator continues running. This wait state is re-
leased when an interrupt is accepted (See note). Since the oscillator
does not stop, the next instruction can be executed at once.
When returning from the stop or the wait state, to accept an interrupt,
set the corresponding interrupt enable bit to “1” before executing the
STP or the WIT instructions.
Note:
In the wait mode, the following interrupts are invalid.
V
SYNC
interrupt
OSD interrupt
All timers interrupts using TIM2 and TIM3 pins input as count source
All timers interrupts using f(X
IN
)/2 as count source
All timers interrupts using f(X
IN
)/4092 as count source
f(X
IN
)/4096 interrupt
Multi-master I
2
C-BUS interface interrupt
A circuit example using a ceramic resonator (or a quartz-crystal os-
cillator) is shown in Figure 8.13.1. Use the circuit constants in accor-
dance with the resonator manufacture’s recommended values. A cir-
cuit example with external clock input is shown in Figure 8.13.2. In-
put the clock to the X
IN
pin, and open the X
OUT
pin.
Fig. 8.13.1 Ceramic Resonator Circuit Example
Fig. 8.13.2 External Clock Input Circuit Example
X
IN
X
OUT
C
IN
Microcomputer
C
OUT
X
IN
Microcomputer
Vcc
Vss
External oscillation circuit
Fig. 8.13.3 Clock Generating Circuit Block Diagram
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相關(guān)PDF資料
PDF描述
M37212EFSP Single Chip 8 Bits Microcomputer(8位單片機(jī))
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37212M8-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
M37220M3 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
M37220M3-010SP 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
M37220M3-155SP 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
M37220M3-157SP 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
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