M37544G Mitsubishi Electric, M37544G Datasheet - Page 39

• Manufacturer Part Number: M37544G
• Description: Single-Chip 8-Bit CMOS Microcomputer
• Manufacturer: Mitsubishi Electric

NOTES ON PERIPHERAL FUNCTIONS
When setting the followings, the interrupt request bit may be set to
“1”.
•When setting external interrupt active edge
Related register: Interrupt edge selection register (address
003A
Timer X mode register (address 2B
Timer A mode register (address 1D
When not requiring the interrupt occurrence synchronized with
these setting, take the following sequence.
more instructions have been executed.
• When n (0 to 255) is written to a timer latch, the frequency divi-
sion ratio is 1/(n+1).
• When a count source of timer X, timer Y or timer Z is switched,
stop a count of timer X.
CNTR
CNTR
switch bit.
When this bit is “0”, the CNTR
the falling edge of the CNTR
the CNTR
the CNTR
However, in the pulse width HL continuously measurement mode,
CNTR
edges of CNTR
CNTR
CNTR
CNTR
switch bit.
When this bit is “0”, the CNTR
the falling edge of CNTR
CNTR
CNTR
Set the corresponding interrupt enable bit to “0” (disabled).
Set the interrupt edge select bit (active edge switch bit) to “1”.
Set the corresponding interrupt enable bit to “1” (enabled).
Interrupt
Timers
Timer A
Set the corresponding interrupt request bit to “0” after 1 or
Timer X
16
1
1
0
0
1
1
0
0
)
interrupt active edge selection
active edge switch bit.
interrupt active edge selection
pin input signal.
interrupt active edge depends on the CNTR
interrupt active edge depends on the CNTR
interrupt request is generated at both rising and falling
interrupt request bit is set to “1” at the rising edge of
1
1
pin input signal.
interrupt request bit is set to “1” at the rising edge of
1
pin input signal regardless of the setting of
0
pin input signal. When this bit is “1”, the
1
1
pin input signal. When this bit is “1”,
0
interrupt request bit is set to “1” at
interrupt request bit is set to “1” at
16
16
)
)
1
0
active edge
active edge
• Serial I/O interrupt
When setting the transmit enable bit to “1”, the serial I/O transmit
interrupt request bit is automatically set to “1”. When not requiring
the interrupt occurrence synchronized with the transmission en-
abled, take the following sequence.
• I/O pin function when serial I/O is enabled.
The functions of P1
of a serial I/O mode selection bit and a serial I/O synchronous
clock selection bit as follows.
(1) Serial I/O mode selection bit
Clock synchronous type serial I/O is selected.
Setup of a serial I/O synchronous clock selection bit
“0” : P1
“1” : P1
Setup of a SRDY1 output enable bit (SRDY)
“0” : P1
“1” : P1
(2) Serial I/O mode selection bit
Clock asynchronous (UART) type serial I/O is selected.
Setup of a serial I/O synchronous clock selection bit
“0”: P1
“1”: P1
When clock asynchronous (UART) type serial I/O is selected, it is
P1
The comparator uses internal capacitors whose charge will be lost
if the clock frequency is too low.
Make sure that f(X
more instructions have been executed.
Set the serial I/O transmit interrupt enable bit to “0” (disabled).
Set the transmit enable bit to “1”.
Set the serial I/O transmit interrupt request bit to “0” after 1 or
Set the serial I/O transmit interrupt enable bit to “1” (enabled).
3
A-D Converter
Serial I/O
pin. It can be used as a normal I/O pin.
2
2
2
2
3
3
pin can be used as a normal I/O pin.
pin turns into an input pin of an external clock.
pin turns into an output pin of a synchronous clock.
pin turns into an input pin of a synchronous clock.
pin can be used as a normal I/O pin.
pin turns into a SRDY output pin.
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
IN
2
) is 500kHz or more during A-D conversion.
and P1
MITSUBISHI MICROCOMPUTERS
3
are switched with the setting values
“1” :
“0” :
7544 Group
39