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| 型号： | M37221MAH-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42 |
| 文件页数： | 87/112页 |
| 文件大小： | 1207K |
| 代理商： | M37221MAH-XXXSP |
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76
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37221M4H/M6H/M8H/MAH–XXXSP/FP
M37221EASP/FP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
8.14 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
“FF16” is set in timer 3 and “0716” is set in the timer 4. Select f(XIN)/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.
VSYNC interrupt
OSD interrupt
Timer 2 interrupt using external clock input from TIM2 pin as count
source
Timer 3 interrupt using external clock input from TIM3 pin as count
source
Timer 4 interrupt using f(XIN)/2 as count source
Timer 1 interrupt using f(XIN)/4096 as count source
f(XIN)/4096 interrupt
Multi-master I2C-BUS interface interrupt
A circuit example using a ceramic resonator (or a quartz-crystal os-
cillator) is shown in Figure 8.14.1. 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 8.14.2. In-
put the clock to the XIN pin, and open the XOUT pin.
Fig. 8.14.1 Ceramic Resonator Circuit Example
Fig. 8.14.2 External Clock Input Circuit Example
XIN
XOUT
CIN
Microcomputer
COUT
XIN
Microcomputer
Vcc
Vss
External oscillation circuit
Fig. 8.14.3 Clock Generating Circuit Block Diagram
Interrupt request
Interrupt disable
flag I
Reset
S
Q
R
STP instruction
S
Q
R
WIT
instruction
S
Q
R
STP
instruction
Reset
Internal clock
φ
1/2
1/8
Timer 3
Timer 4
XOUT
XIN
T34M0
T34M2
Selection gate :
Connected to black
side at reset.
T34M :
Timer 34 mode register
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37224M3 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37224M3-050SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37224M3-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37225ECSP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
| M37225M6 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER |
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