Datasheet

Section 1 Overview
Rev. 2.00 Aug. 20, 2008 Page 17 of 1198
REJ09B0403-0200
Pin No.
Type Symbol
H8S/2462
144-Pin
H8S/2463
144-Pin
H8S/2472
176-Pin
I/O Name and Function
RD
25 25
J2
Output
Low level on this pin indicates that
the MCU is reading from an
external address space.
HWR
6 6
C1
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
26 26
K4
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 19
G2
Output
Low level on this pin indicates that
the address output on the address
bus is valid.
Bus control
CS256
17 17
G3
Output
Indicates access to the 256-Kbyte
area of H'F80000 to H'FBFFFF.
WR
6 6
C1
Output
Low level on this pin indicates that
the MCU is writing to an external
address space.
HBE
22 22
H2
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 24
J3
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 23
J4
Output
Address latch signal for the
address-data multiplex bus
ETRST 91 90 G12 Input
ETMS 87 86 H12 Input
ETDO 88 87 H13 Output
ETDI 89 88 H15 Input
Boundary
scan
ETCK 90 89 H14 Input
Boundary scan interface pins