M38062M3-156FP MITSUBISHI [Mitsubishi Electric Semiconductor], M38062M3-156FP Datasheet - Page 29

• Manufacturer Part Number: M38062M3-156FP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Clock Generating Circuit
An oscillation circuit can be formed by connecting a resonator be-
tween X
the X
Oscillation control
Stop Mode
If the STP instruction is executed, the internal clock
“H”. Timer 1 is set to “01
Oscillator restarts when an external interrupt is received, but the
internal clock
This allows time for the clock circuit oscillation to stabilize.
If oscillator is restarted by a reset, no wait time is generated, so
keep the RESET pin at an “L” level until oscillation has stabilized.
Wait Mode
If the WIT instruction is executed, the internal clock
“H” level, but the oscillator itself does not stop. The internal clock
restarts if a reset occurs or when an interrupt is received.
Since the oscillator does not stop, normal operation can be started
immediately after the clock is restarted.
To ensure that interrupts will be received to release the STP or
WIT state, interrupt enable bits must be set to “1” before the STP
or WIT instruction is executed.
Fig. 27 Block diagram of clock generating circuit
Interrupt request
Interrupt disable
flag (I)
IN
pin and make the X
IN
______
and X
remains at an “H” until timer 1 underflow.
OUT
. To supply a clock signal externally, input it to
16
” and prescaler 12 is set to “FF
OUT
Reset
X
IN
Single-chip mode
pin open.
ONW pin
STP instruction
Rf
X
OUT
1/2
Rd
stops at an
stops at an
S
R
16
”.
Q
WIT
instruction
ONW
control
1/8
When the STP status is released, prescaler 12 and timer 1 will
start counting and reset will not be released until timer 1
underflows, so set the timer 1 interrupt enable bit to “0” before the
STP instruction is executed.
Fig. 25 Ceramic resonator circuit
Fig. 26 External clock input circuit
S
R
FF
Prescaler 12
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
16
Q
C
External oscillation
circuit
IN
X
IN
X
MITSUBISHI MICROCOMPUTERS
IN
01
Q
16
Timer 1
S
R
Internal clock
STP instruction
Vcc
Vss
3806 Group
Reset or STP instruction
X
Reset
OUT
Open
X
OUT
C
OUT
output
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