Datasheet

Section 1 Overview
Rev. 2.00 Sep. 28, 2009 Page 12 of 870
REJ09B0429-0200
Type Symbol Pin No. I/O Name and Function
WAIT 17
Input
Requests wait state insertion to bus cycles
when an external tri-state address space is
accessed.
RD 21
Output
Low level on this pin indicates that the
MCU is reading from an external address
space.
HWR 20
Output
Low level on this pin indicates that the
MCU is writing to an external address
space.
The upper byte of the data bus is valid.
LWR 24
Output
Low level on this pin indicates that the
MCU is writing to an external address
space.
The lower byte of the data bus is valid.
AS/IOS 19
Output
Low level on this pin indicates that the
address output on the address bus is valid.
CS256 17
Output
Indicates access to the 256-Kbyte area of
H’F80000 to H'FBFFFF.
WR 20
Output
Low level on this pin indicates that the
MCU is writing to an external address
space.
HBE 22
Output
Low level on this pin indicates that the
MCU is accessing an external address
space.
The upper byte of the data bus is valid.
LBE 24
Output
Low level on this pin indicates that the
MCU is accessing an external address
space.
The lower byte of the data bus is valid.
Bus control
AH 23
Output
Address latch signal for the address-data
multiplex bus
ETRST
91
Input
ETMS
87
Input
ETDO
88
Output
Boundary
scan
ETDI
89
Input
Boundary scan interface pins
ETCK
90
Input