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參數(shù)資料
| 型號(hào)： | M37373M8-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP52 |
| 封裝： | 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-52 |
| 文件頁數(shù)： | 82/110頁 |
| 文件大?。?/td> | 1537K |
| 代理商： | M37373M8-XXXSP |
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73
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37273M8-XXXSP
M37273E8SP
CLOCK GENERATING CIRCUIT
The M37273M8-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 6 of the OSD 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, connect 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 78. 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 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 execution of
the STP instruction). Moreover, 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 overflows, allow-
ing time for oscillation stabilization when a ceramic 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 oscillation continues. This wait state is released at
reset or when an interrupt is accepted (Note). Since oscillation 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 TIM2 pin input as count
source
(4) Timer 3 interrupt using 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. 78. Ceramic Resonator Circuit Example
Fig. 79. 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. To reduce
the XCIN-XCOUT drivability, clear bit 5 (CM5) of the CPU mode regis-
ter (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 software before executing.
XCIN
XIN
CCIN
M37273M8-XXXSP
XCOUT
Rf
Rd
CCOUT
XOUT
CIN
COUT
XCIN
M37273M8-XXXSP
External oscillation
circuit or external
pulse
XCOUT XIN
XOUT
Open
External oscillation
circuit
Vcc
Vss
Vcc
Vss
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相關(guān)代理商/技術(shù)參數(shù) |
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| M373T WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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