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| 型号： | M37270EF-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP64 |
| 封装： | 0.750 INCH, 1.78 MM PITCH, PLASTIC, SDIP-64 |
| 文件页数： | 81/97页 |
| 文件大小： | 1359K |
| 代理商： | M37270EF-XXXSP |
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MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
79
CLOCK GENERATING CIRCUIT
The M37270MF-XXXSP has 2 built-in oscillation circuits. An oscilla-
tion circuit can be formed by connecting a resonator between XIN
and XOUT (XCIN and XCOUT). Use the circuit constants in accordance
with the resonator manufacturer’s recommended values. No exter-
nal resistor is needed between XIN and XOUT since a feed-back re-
sistor exists on-chip. However, an external feed-back resistor is
needed between XCIN and XCOUT. When using XCIN-XCOUT as sub-
clock, clear bits 5 and 4 of the clock source control register to “0.” To
supply a clock signal externally, input it to the XIN (XCIN) pin and
make the XOUT (XCOUT) pin open. When not using XCIN clock, con-
nect the XCIN to VSS and make the XCOUT pin open.
After reset has completed, the internal clock
φ is half the frequency of
XIN. Immediately after poweron, both the XIN and XCIN clock start
oscillating. To set the internal clock
φ to low-speed operation mode,
set bit 7 of the CPU mode register (address 00FB16) to “1.”
Oscillation Control
(1) Stop mode
The built-in clock generating circuit is shown in Figure 56. When the
STP instruction is executed, the internal clock
φ stops at “H” level. At
the same time, timers 3 and 4 are connected in hardware and “FF16”
is set in the timer 3, “0716” is set in the timer 4. Select f(XIN)/16 or
f(XCIN)/16 as the timer 3 count source (set both bit 0 of the timer
mode register 2 and bit 6 at address 00C716 to “0” before the execu-
tion of the STP instruction). And besides, set the timer 3 and timer 4
interrupt enable bits to disabled (“0”) before execution of the STP
instruction. The oscillator restarts when external interrupt is accepted,
however, the internal clock
φ keeps its “H” level until timer 4 over-
flows. Because this allows time for oscillation stabilizing when a ce-
ramic resonator or a quartz-crystal oscillator is used.
(2) Wait mode
When the WIT instruction is executed, the internal clock
φ stops in
the “H” level but the oscillator continues running. This wait state is
released at reset or when an interrupt is accepted (Note). Since the
oscillator does not stop, the next instruction can be executed at once.
Note: In the wait mode, the following interrupts are invalid.
(1) VSYNC interrupt
(2) OSD interrupt
(3) Timers 1 and 2 interrupts using P42/TIM2 pin input as count
source
(4) Timer 3 interrupt using P43/TIM3 pin input as count source
(5) Data slicer interrupt
(6) Multi-master I2C-BUS interface interrupt
(7) f(XIN)/4096 interrupt
(8) All timer interrupts using f(XIN)/2 or f(XCIN)/2 as count source
(9) All timer interrupts using f(XIN)/4096 or f(XCIN)/4096 as
count source
(10) A-D conversion interrupt
Fig. 91. Ceramic resonator circuit example
Fig. 92. External clock input circuit example
(3) Low-Speed Mode
If the internal clock is generated from the sub-clock (XCIN), a low
power consumption operation can be realized by stopping only the
main clock XIN. To stop the main clock, set bit 6 (CM6) of the CPU
mode register (00FB16) to “1.” When the main clock XIN is restarted,
the program must allow enough time to for oscillation to stabilize.
Note that in low-power-consumption mode the XCIN-XCOUT drivability
can be reduced, allowing even lower power consumption (60 A
with f (XCIN) = 32kHz). To reduce the XCIN-XCOUT drivability, clear bit
5 (CM5) of the CPU mode register (00FB16) to “0.” At reset, this bit is
set to “1” and strong drivability is selected to help the oscillation to
start. When an STP instruction is executed, set this bit to “1” by soft-
ware before executing.
XCIN
XIN
CCIN
M37270MF-XXXSP
XCOUT
Rf
Rd
CCOUT
XOUT
CIN
COUT
XCIN
M37270MF-XXXSP
External oscillation
circuit or external
pulse
XCOUT XIN
XOUT
Open
External oscillation
circuit
Vcc
Vss
Vcc
Vss
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37270ERSS | 功能描述:EMULATION MCU/8BIT CMOS EMULATIO RoHS:否 类别:编程器，开发系统 >> 配件 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 标准包装:1 系列:- 附件类型:USB 至 1-Wire? RJ11 适配器 适用于相关产品:1-Wire? 设备 产品目录页面:1429 (CN2011-ZH PDF) |
| M37270MF | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37270MF-100SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37270MF-101SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37270MF-103SP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
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