M16C Datasheet, PDF (7/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Unddeevrelopment
Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
DPienscDreipstciorinption
Table 1-3. Pin Description of M16C/6N group (1)
Pin name Signal name
I/O type
Function
VCC, VSS
Power supply
input
Supply 4.0 to 5.5 V to the VCC pin. Supply 0 V to the VSS pin.
CNVSS
CNVSS
Input
This pin switches between processor modes. Connect it to the
VSS pin to operate in single-chip or memory expansion mode.
Connect it to the VCC pin to operate in microprocessor mode.
RESET
Reset input Input
A “L” on this input resets the microcomputer.
XIN
XOUT
Clock input
Clock output
Input
Output
These pins are provided for the main clock generating circuit.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
AVCC
External data Input
bus width
select input
Analog power
supply input
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
operating in single-chip mode,connect this pin to VSS.
This pin is a power supply input for the A-D converter. Connect this
pin to VCC.
AVSS
Analog power
supply input
This pin is a power supply input for the A-D converter. Connect this
pin to VSS.
VREF
P00 to P07
D0 to D7
P10 to P17
Reference
voltage input
I/O port P0
I/O port P1
Input
This pin is a reference voltage input for the A-D converter.
Input/output
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, the user can specify in units of four
bits via software whether or not they are tied to a pull-up resistor.
Pins in this port also function as A-D converter input pins.
Input/output When set as a separate bus, these pins input and output data (D0–D7).
Input/output This is an 8-bit I/O port equivalent to P0. Pins in this port also function
as external interrupt pins as selected by software.
D8 to D15
Input/output When set as a separate bus, these pins input and output data (D8–D15).
P20 to P27
A0 to A7
I/O port P2
Input/output This is an 8-bit I/O port equivalent to P0. Pins in this port also function
as A-D converter input pins.
Output
These pins output 8 low-order address bits (A0–A7).
A0/D0 to
A7/D7
A0, A1/D0
to A7/D6
Input/output If the external bus is set as an 8-bit wide multiplexed bus, these pins
input and output data (D0–D7) and output 8 low-order address bits
(A0–A7) separated in time by multiplexing.
Output
If the external bus is set as a 16-bit wide multiplexed bus, these pins
Input/output input and output data (D0–D6) and output address (A1–A7) separated
in time by multiplexing. They also output address (A0).
P30 to P37 I/O port P3 Input/output This is an 8-bit I/O port equivalent to P0.
A8 to A15
A8/D7,
A9 to A15
P40 to P47 I/O port P4
Output
These pins output 8 middle-order address bits (A8–A15).
Input/output If the external bus is set as a 16-bit wide multiplexed bus, these pins
Output
input and output data (D7) and output address (A8) separated in time
by multiplexing. They also output address (A9–A15).
Input/output This is an 8-bit I/O port equivalent to P0.
CS0 to CS3,
A16 to A19
Output
Output
These pins output CS0–CS3 signals and A16–A19. CS0–CS3 are chip
select signals used to specify an access space. A16–A19 are 4 high-
order address bits.
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