M16C80 Datasheet, PDF (20/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
1. Overview
1.6 Pin Description (1)
Pin name Signal name I/O type
Function
VCC, VSS
CNVSS
Power supply
input
CNVSS
Supply 4.2 (2.7) to 5.5 V to the VCC pin. Supply 0 V to the VSS pin.
I ^{This pin switches between processor modes. Connect it to the VSS}
when operating in single-chip or memory expansion mode after reset.
Connect it to the VCC when in microprocessor mode after reset.
RESET
XIN
XOUT
BYTE
Reset input
Clock input
Clock output
External data
bus width
select input
I An “L” on this input resets the microcomputer.
I These pins are provided for the main clock generating circuit. Connect
O
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.
I This pin selects the width of an data bus in the external area 3. 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 VSS.
AVCC
Analog power
supply input
This pin is a power supply input for the A/D converter. Connect this
pin to VCC.
AVSS
VREF
P00 to P07
Analog power
supply input
Reference
voltage input
I/O port P0
This pin is a power supply input for the A/D converter. Connect this
pin to VSS.
I This pin is a reference voltage input for the A/D converter.
I/O 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.
D0 to D7
P10 to P17
I/O port P1
D8 to D15
P20 to P27
A0 to A7
A0/D0 to
A7/D7
I/O port P2
P30 to P37
A8 to A15
A8/D8 to
A15/D15
I/O port P3
MA0 to MA7
I/O When set as a separate bus, these pins input and output data (D0–D7).
I/O This is an 8-bit I/O port equivalent to P0. P15 to P17 also function as
external interrupt pins as selected by software.
I/O When set as a separate bus, these pins input and output data (D8–D15).
I/O This is an 8-bit I/O port equivalent to P0.
O These pins output 8 low-order address bits (A0–A7).
I/O If a multiplexed bus is set, these pins input and output data (D0–D7)
and output 8 low-order address bits (A0–A7) separated in time by
multiplexing.
I/O This is an 8-bit I/O port equivalent to P0.
O These pins output 8 middle-order address bits (A8–A15).
I/O If the external bus is set as a 16-bit wide multiplexed bus, these pins
input and output data (D8–D15) and output 8 middle-order address
bits (A8–A15) separated in time by multiplexing.
O ^{If accessing to DRAM area, these pins output row address and}
column address separated in time by multiplexing.
Rev.1.00 Aug. 02, 2005 ^{Page 9}
REJ09B0187-0100
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