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參數(shù)資料
| 型號(hào)： | M37271MF-XXXSP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| 中文描述： | 單芯片8位CMOS微機(jī)隱蔽字幕解碼器和屏幕顯示控制器 |
| 文件頁(yè)數(shù)： | 81/97頁(yè) |
| 文件大?。?/td> | 1436K |
| 代理商： | M37271MF-XXXSP |
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MITSUBISHI MICROCOMPUTERS
M37271MF-XXXSP
M37271EF-XXXSP, M37271EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
81
CLOCK GENERATING CIRCUIT
The M37271MF-XXXSP has 2 built-in oscillation circuits. An oscilla-
tion circuit can be formed by connecting a resonator between X
IN
and X
OUT
(X
CIN
and X
COUT
). Use the circuit constants in accordance
with the resonator manufacturer’s recommended values. No exter-
nal resistor is needed between X
IN
and X
OUT
since a feed-back re-
sistor exists on-chip. However, an external feed-back resistor is
needed between X
CIN
and X
COUT
. When using X
CIN
-X
COUT
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 X
IN
(X
CIN
) pin and
make the X
OUT
(X
COUT
) pin open. When not using X
CIN
clock, con-
nect the X
CIN
to V
SS
and make the X
COUT
pin open.
After reset has completed, the internal clock
φ
is half the frequency of
X
IN
. Immediately after poweron, both the X
IN
and X
CIN
clock start
oscillating. To set the internal clock
φ
to low-speed operation mode,
set bit 7 of the CPU mode register (address 00FB
16
) to “1.”
Oscillation Control
(1) Stop mode
The built-in clock generating circuit is shown in Figure 93. 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 “FF
16
”
is set in the timer 3, “07
16
” is set in the timer 4. Select f(X
IN
)/16 or
f(X
CIN
)/16 as the timer 3 count source (set both bit 0 of the timer
mode register 2 and bit 6 at address 00C7
16
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) V
SYNC
interrupt
(2) OSD interrupt
(3) Timers 1 and 2 interrupts using P4
2
/TIM2 pin input as count
source
(4) Timer 3 interrupt using P4
3
/TIM3 pin input as count source
(5) Data slicer interrupt
(6) Multi-master I
2
C-BUS interface interrupt
(7) f(X
IN
)/4096 interrupt
(8) All timer interrupts using f(X
IN
)/2 or f(X
CIN
)/2 as count source
(9) All timer interrupts using f(X
IN
)/4096 or f(X
CIN
)/4096 as
count source
(10) A-D conversion interrupt
Fig. 93. Ceramic resonator circuit example
Fig. 94. External clock input circuit example
(3) Low-Speed Mode
If the internal clock is generated from the sub-clock (X
CIN
), a low
power consumption operation can be realized by stopping only the
main clock X
IN
. To stop the main clock, set bit 6 (CM
6
) of the CPU
mode register (00FB
16
) to “1.” When the main clock X
IN
is restarted,
the program must allow enough time to for oscillation to stabilize.
Note that in low-power-consumption mode the X
CIN
-X
COUT
drivability
can be reduced, allowing even lower power consumption (60
μ
A with
f (X
CIN
) = 32kHz). To reduce the X
CIN
-X
COUT
drivability, clear bit 5
(CM
5
) of the CPU mode register (00FB
16
) 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.
X
CIN
X
IN
C
CIN
M37271MF-XXXSP
X
COUT
R
f
R
d
C
COUT
X
OUT
C
IN
C
OUT
X
CIN
M37271MF-XXXSP
External oscillation
circuit or external
pulse
X
COUT
X
IN
X
OUT
Open
Open
External oscillation
circuit
Vcc
Vss
Vcc
Vss
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