M37515M4-XXXHP Datasheet, PDF (8/55 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
M37515M4-XXXHP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
I/O PORTS
The I/O ports have direction registers which determine the input/
output direction of each individual pin. Each bit in a direction reg-
ister corresponds to one pin, and each pin can be set to be input
port or output port.
When “0” is written to the bit corresponding to a pin, that pin be-
comes an input pin. When “1” is written to that bit, that pin
becomes an output pin.
If data is read from a pin which is set to output, the value of the
port output latch is read, not the value of the pin itself. Pins set to
input are floating. If a pin set to input is written to, only the port
output latch is written to and the pin remains floating.
Table 2 I/O port function
Pin
P00–P07
Name
Port P0
P10–P17
Port P1
P20/XCOUT
P21/XCIN
P22/SDA1
P23/SCL1
P24/SDA2/RxD
P25/SCL2/TxD
Port P2
Input/Output
Input/output,
individual
bits
I/O Structure
CMOS compatible
input level
CMOS 3-state output
CMOS compatible
input level
CMOS/SMBUS input
level (when selecting
I²C-BUS interface
function)
N-channel open-drain
output
CMOS compatible
input level
CMOS/SMBUS input
level (when selecting
I²C-BUS interface
function)
CMOS 3-state output
N-channel open-drain
output (when
selecting I²C-BUS
interface function)
P26/SCLK
P27/CNTR0/SRDY
P30/AN0—
P37/AN7
P40/CNTR1
P41/INT0—
P43/INT2
P44/INT3/PWM
P45—P47
Port P3
Port P4
CMOS compatible
input level
CMOS 3-state output
Non-Port Function
Related SFRs
Sub-clock generating
circuit
CPU mode register
I²C-BUS interface func-
tion I/O
I²C control register
I²C-BUS interface func-
tion I/O
Serial I/O function I/O
I²C control register
Serial I/O control
register
Serial I/O function I/O
Serial I/O function I/O
Timer X function I/O
Serial I/O control
register
Serial I/O control
register
Timer XY mode register
A-D conversion input
A-D control register
Timer Y function I/O
External interrupt input
External interrupt input
PWM output
Timer XY mode register
Interrupt edge selection
register
Interrupt edge selection
register
PWM control register
Ref.No.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(1)
7