deveopmen
Pin Description
Preliminary Specifications REV.D
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C/80 (100-pin version) group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
8
V
CC
, V
SS
CNV
SS
X
IN
X
OUT
BYTE
AV
CC
AV
SS
V
REF
P0
0
to P0
7
D
0
to D
7
P1
0
to P1
7
D
8
to D
15
P2
0
to P2
7
A
0
to A
7
A
0
/D
0
to
A
7
/D
7
P3
0
to P3
7
A
8
to A
15
A
8
/D
8
to
A
15
/D
15
Signal name
Power supply
input
CNV
SS
Reset input
Clock input
Clock output
External data
bus width
select input
Analog power
supply input
Reference
voltage input
I/O port P0
I/O port P1
I/O port P2
I/O port P3
Supply 4.2 to 5.5 V to the V
CC
pin. Supply 0 V to the V
SS
pin.
Function
This pin switches between processor modes. Connect it to the V
SS
when operating in single-chip or memory expansion mode after reset.
Connect it to the V
CC
when in microprocessor mode after reset.
A “L” on this input resets the microcomputer.
These pins are provided for the main clock generating circuit. Connect
a ceramic resonator or crystal between the X
IN
and the X
OUT
pins. To
use an externally derived clock, input it to the X
IN
pin and leave the
X
OUT
pin open.
This pin selects the width of an external data bus. A 16-bit width is
selected when this input is “L”; an 8-bit width is selected when this
input is “H”. This input must be fixed to either “H” or “L”. When
not using the external bus,connect this pin to V
SS
.
This pin is a power supply input for the A-D converter. Connect this
pin to V
CC
.
This pin is a power supply input for the A-D converter. Connect this
pin to V
SS
.
This pin is a reference voltage input for the A-D converter.
This is an 8-bit CMOS I/O port. It has an input/output port direction
register that allows the user to set each pin for input or output
individually. When set for input in single chip mode, the user can
specify in units of four bits via software whether or not they are tied to a
pull-up resistance. In memory expansion and microprocessor mode,
an built-in pull-up resistance cannot be used. However, it is possible to
select pull-up resistance presence to the usable port as I/O port by
setting.
When set as a separate bus, these pins input and output data (D
0
–D
7
).
This is an 8-bit I/O port equivalent to P0. P1
5
to P1
7
also function as
external interrupt pins as selected by software.
When set as a separate bus, these pins input and output data
(D
8
–D
15
).
This is an 8-bit I/O port equivalent to P0.
These pins output 8 low-order address bits (A
0
–A
7
).
If a multiplexed bus is set, these pins input and output data (D
0
–D
7
) and
output 8 low-order address bits (A
0
–A
7
) separated in time by
multiplexing.
This is an 8-bit I/O port equivalent to P0.
These pins output 8 middle-order address bits (A
8
–A
15
).
If the external bus is set as a 16-bit wide multiplexed bus, these pins
input and output data (D
8
–D
15
) and output 8 middle-order address bits
(A
8
–A
15
) separated in time by multiplexing.
Pin name
Input
Input
Input
Output
Input
Input
Input/output
Input/output
Input/output
Input/output
I/O type
Analog power
supply input
Input/output
Output
Input/output
Input/output
Output
Input/output
RESET
MA0 to MA7
If accessing to DRAM area, these pins output row address and column
address separated in time by multiplexing.
Output
Pin Description