
DESCRIPTION
7702/7703 Group User’s Manual
1–6
1.3 Pin description
Tables 1.3.1 to 1.3.3 list the pin description. However, the pin description in the EPROM mode of the built-
in PROM version is described to section “19.2 EPROM mode.”
7703 Group
The 7703 Group does not have part of pins. Refer to “Chapter 20. 7703 GROUP.”
Table 1.3.1 Pin description (1)
1.3 Pin description
Functions
Supply 5 V ±10 %
V to Vcc pin and 0 V to Vss pin.
This pin controls the processor mode.
[Single-chip mode] [Memory expansion mode]
Connect to Vss pin.
[Microprocessor mode]
Connect to Vcc pin.
The microcomputer is reset when supplying “L” level
to this pin.
These are I/O pins of the internal clock generating
circuit. Connect a ceramic resonator or quartz-crystal
oscillator between pins XIN and XOUT. When using an
external clock, the clock source should be input to XIN
pin and XOUT pin should be left open.
_
This pin outputs E signal.
Data/instruction code read or data write is performed
when output from this pin is “L” level.
[Single-chip mode]
Connect to Vss.
[Memory expansion mode] [Microprocessor mode]
Input level to this pin determines whether the external
data bus has a 16-bit width or 8-bit width. The width
is 16 bits when the level is “L”, and 8 bits when the
level is “H”.
The power supply pin for the A-D converter. Externally
connect AVcc to Vcc pin.
The power supply pin for the A-D converter. Externally
connect AVss to Vss pin.
This is a reference voltage input pin for the A-D converter.
Pin
Vcc, Vss
CNVss
______
RESET
XIN
XOUT
_
E
BYTE
AVcc
AVss
VREF
Input/Output
Input
Output
Input
V : In the low voltage version, supply 2.7–5.5V to Vcc.
Name
Power supply
CNVss
Reset input
Clock input
Clock output
Enable output
Bus width selection
input
Analog supply
Reference voltage input