Udenvdeelropment
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C / 62P Group
Overview
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.1.4 Pin Description (100-pin and 128-pin Packages) (Continued)
Pin name Signal name I/O type Power supply
Function
VCC1, VCC2, Power supply
VSS
input
CNVSS
CNVSS
Input
VCC1
Apply 2.7V to 5.5 V to the VCC1 and VCC2 pins and 0 V to the VSS
pin. The Vcc apply condition is that VCC2 ≤ VCC1 (Note)
This pin switches between processor modes. Connect this pin to
VSS pin when after a reset you want to start operation in single-
chip mode (memory expansion mode) or the VCC1 pin when
starting operation in microprocessor mode.
RESET
XIN
XOUT
Reset input Input
Clock input Input
Clock output Output
VCC1
VCC1
“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 XIN
and the XOUT pins. To use an externally derived clock, input it to
the XIN pin and leave the XOUT pin open.
BYTE
External data Input
bus width
select input
AVCC
Analog power
supply input
AVSS
Analog power
supply input
VREF
Reference Input
voltage input
P00 to P07 I/O port P0 Input/output VCC2
D0 to D7
Input/output
P10 to P17 I/O port P1 Input/output VCC2
D8 to D15
Input/output
P20 to P27 I/O port P2 Input/output VCC2
A0 to A7
A0/D0 to
A7/D7
Output
Input/output
A0
A1/D0 to
A7/D6
P30 to P37
A8 to A15
A8/D7,
A9 to A15
I/O port P3
Output
Input/output
Input/output VCC2
Output
Input/output
Output
P40 to P47 I/O port P4
A16 to A19,
CS0 to CS3
Input/output VCC2
Output
Output
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 VSS pin when operating in single-chip mode.
This pin is a power supply input for the A-D converter. Connect
this pin to VCC1.
This pin is a power supply input for the A-D converter. Connect
this pin to VSS.
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 (D0
–D7).
This is an 8-bit I/O port equivalent to P0. P15 to P17 also function
as INT interrupt input pins as selected by a program.
When set as a separate bus, these pins input and output data (D8
–D15).
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 (A0 to A7).
If the external bus is set as an 8-bit wide multiplexed bus, these
pins input and output data (D0 to D7) and output 8 low-order
address bits (A0 to A7) separated in time by multiplexing.
If the external bus is set as a 16-bit wide multiplexed bus, these
pins input and output data (D0 to D6) and output address (A1 to A7)
separated in time by multiplexing. They also output address (A0).
This is an 8-bit I/O port equivalent to P0.
These pins output 8 middle-order address bits (A8 to A15).
If the external bus is set as a 16-bit wide multiplexed bus, these
pins input and output data (D7) and output address (A8)
separated in time by multiplexing. They also output address (A9
to A15).
This is an 8-bit I/O port equivalent to P0.
These pins output A16 to A19 and CS0 to CS3 signals. A16 to A19
are 4 high- order address bits. CS0 to CS3 are chip select signals
used to specify an access space.
Note: In this manual, hereafter, VCC refers to VCC1 unless otherwise noted.
9