Overview
9
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
V
CC1
, V
CC2
,
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
A
0
A
1
/D
0
to
A
7
/D
6
P3
0
to P3
7
A
8
to A
15
A
8
/D
7
,
A
9
to A
15
P4
0
to P4
7
A
16
to A
19
,
CS
0
to CS
3
Signal name
Power supply
input
CNV
SS
Reset input
Clock input
Clock output
External data
bus width
select input
Analog power
supply input
Analog power
supply input
Reference
voltage input
I/O port P0
I/O port P1
I/O port P2
I/O port P3
I/O port P4
Apply 2.7V to 5.5 V to the V
CC1
and V
CC2
pins and 0 V to the V
SS
pin. The Vcc apply condition is that V
CC2
≤
V
CC1
Function
This pin switches between processor modes. Connect this pin to
V
SS
pin when after a reset you want to start operation in single-
chip mode (memory expansion mode) or the V
CC1
pin when
starting operation in microprocessor mode.
“L” on this input resets the microcomputer.
These pins are provided for the main clock generating circuit input/
output. 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”. Connect
this pin to the V
SS
pin when operating in single-chip mode.
This pin is a power supply input for the A-D converter. Connect
this pin to V
CC1
.
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. This port has an input/output select
direction register, allowing each pin in that port to be directed for
input or output individually.
If any port is set for input, selection can be made for it in a program
whether or not to have a pull-up resistor in 4 bit units. This selection
is unavailable in memory extension and microprocessor modes.
This port can function as input pins for the A-D converter when so
selected in a program.
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 INT interrupt input pins as selected by a program.
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. This port can function as
input pins for the A-D converter when so selected in a program.
These pins output 8 low-order address bits (A
0
to A
7
).
If the external bus is set as an 8-bit wide multiplexed bus, these
pins input and output data (D
0
to D
7
) and output 8 low-order
address bits (A
0
to A
7
) separated in time by multiplexing.
If the external bus is set as a 16-bit wide multiplexed bus, these
pins input and output data (D
0
to D
6
) and output address (A
1
to A
7
)
separated in time by multiplexing. They also output address (A
0
).
This is an 8-bit I/O port equivalent to P0.
These pins output 8 middle-order address bits (A
8
to A
15
).
If the external bus is set as a 16-bit wide multiplexed bus, these
pins input and output data (D
7
) and output address (A
8
)
separated in time by multiplexing. They also output address (A
9
to A
15
).
This is an 8-bit I/O port equivalent to P0.
These pins output A
16
to A
19
and CS
0
to CS
3
signals. A
16
to A
19
are 4 high- order address bits. CS
0
to CS
3
are chip select signals
used to specify an access space.
Pin name
Input
Input
Input
Output
Input
Input
Input/output
Input/output
Input/output
Input/output
I/O type
Input/output
Output
Input/output
Output
Input/output
Input/output
Output
Input/output
Output
Input/output
Output
Output
RESET
(Note)
Power supply
V
CC1
V
CC2
V
CC1
V
CC1
V
CC2
V
CC2
V
CC2
V
CC2
Table 1.1.4 Pin Description (100-pin and 128-pin Packages) (Continued)
Note: In this manual, hereafter, V
CC
refers to V
CC1
unless otherwise noted.