參數(shù)資料
型號(hào)： M37220M3
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 8 Bits Microcomputer(8位單片機(jī))
中文描述： 單芯片8位單片機(jī)（8位單片機(jī)）
文件頁(yè)數(shù)： 43/53頁(yè)
文件大?。?/td> 1281K
代理商： M37220M3
MITSUBISHI MICROCOMPUTERS
M37220M3-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
43
CLOCK GENERATING CIRCUIT
The built-in clock generating circuit is shown in Figure 48. When the
STP instruction is executed, the internal clock
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
as the timer 3 count source (set bit 0 of the timer 34 mode register to
“0” before the execution of the STP instruction). And besides, 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
until timer 4 overflows. Because this allows time for oscillation stabi-
lizing when a ceramic resonator or a quartz-crystal oscillator is used.
When the WIT instruction is executed, the internal clock
the “H” level but the oscillator continues running. This wait state is
released when an interrupt is accepted (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.
stops at “H” level.
keeps its “H” level
stops in
Note:
In the wait mode, the following interrupts are invalid.
(1) V
SYNC
interrupt
(2) CRT interrupt
(3) f(X
IN
)/4096 interrupt
(4) Timer 1 interrupt using f(X
IN
)/4096 as count source
(5) Timer 2 interrupt using P2
4
/TIM2 pin input as count source
(6) Timer 3 interrupt using P2
3
/TIM3 pin input as count source
(7) Timer 4 interrupt using f(X
IN
)/2 as count source
(8) Multi-master I
2
C-BUS interface interrupt
The circuit example using a ceramic resonator (or a quartz-crystal
oscillator) is shown in Figure 46. Use the circuit constants in accor-
dance with the resonator manufacture’s recommended values. The
circuit example with external clock input is shown in Figure 47. Input
the clock to the X
IN
pin, and open the X
OUT
pin.
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
1/2
1/8
Timer 3
Timer 4
X
OUT
X
IN
T34M0
T34M2
Selection gate :
Connected to black
colored side at reset.
T34M : Timer 34 mode
register
Fig. 48. Clock generating circuit block diagram
Fig. 47. External clock input circuit example
Fig. 46. Ceramic resonator circuit example
X
IN
X
OUT
C
IN
M 37220M 3-XXXSP
C
OUT
20
19
X
IN
19
M37220M3-XXXSP
Vcc
Vss
External oscillation circuit
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