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| 型號(hào)： | M37272MFH |
| 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)： | 93/131頁(yè) |
| 文件大小： | 1297K |
| 代理商： | M37272MFH |
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93
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37272M6H/M8H/MAH/MFH
–
XXXSP/FP
M37272E8SP/FP, M37272EFSP/FP
MITSUBISHI MICROCOMPUTERS
Rev 1.0
8.14 CLOCK GENERATING CIRCUIT
This microcomputer has 2 built-in oscillation circuits. An oscillation
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 external re-
sistor is needed between X
IN
and X
OUT
since a feed-back resistor
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 6 of the OSD 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, connect 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 to “1.”
8.14.1 OSCILLATION CONTROL
(1) Stop Mode
The built-in clock generating circuit is shown in Figure 120. 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 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 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 HIGH level until timer 4 overflows, al-
lowing 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 HIGH level but the oscillator continues running. This wait state is
released at reset or when an interrupt is accepted (See 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.
V
SYNC
interrupt
OSD interrupt
All timer interrupts using external clock input from port pin as count
source
All timer interrupts using f(X
IN
)/2 or f(X
CIN
)/2 as count source
All timer interrupts using f(X
IN
)/4096 or f(X
CIN
)/4096 as count source
f(X
IN
)/4096 interrupt
Multi-master I
2
C-BUS interface interrupt
Data slicer interrupt
A-D conversion interrupt
Fig.8.14.1 Ceramic Resonator Circuit Example
Fig.8.14.2 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 (CM6) 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. To reduce
the X
CIN
-X
COUT
drivability, clear bit 5 (CM5) of the CPU mode regis-
ter (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 software before executing.
X
C
I
N
X
I
N
C
C
I
N
M
i
c
r
o
c
o
m
p
u
t
e
r
X
C
O
U
T
R
f
R
d
C
C
O
U
T
X
OUT
C
IN
C
OUT
X
C
I
N
M
i
c
r
o
c
o
m
p
u
t
e
r
E
c
p
x
i
u
t
c
l
e
u
s
r
i
e
n
t
a
o
l
r
o
e
s
x
c
t
i
l
l
r
a
n
t
a
i
o
l
n
r
e
X
C
O
U
T
X
I
N
X
O
U
T
O
p
e
n
O
p
e
n
External oscillation
circuit
V
Vss
c
c
Vcc
Vss
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