HD6473032F16 Datasheet, PDF (141/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 6 Bus Controller
6.1.3 Pin Configuration
Table 6.1 summarizes the bus controller’s input/output pins.
Table 6.1 Bus Controller Pins
Name
Chip select 0 to 7
Address strobe
Abbreviation
CS0 to CS7
AS
Read
RD
High write
HWR
I/O
Output
Output
Output
Output
Low write
LWR
Output
Wait
WAIT
Bus request
BREQ
Bus acknowledge BACK
Input
Input
Output
Function
Strobe signals selecting areas 0 to 7
Strobe signal indicating valid address output
on the address bus
Strobe signal indicating reading from the
external address space
Strobe signal indicating writing to the
external address space, with valid data on
the upper data bus (D15 to D8)
Strobe signal indicating writing to the
external address space, with valid data on
the lower data bus (D7 to D0)
Wait request signal for access to external
three-state-access areas
Request signal for releasing the bus to an
external device
Acknowledge signal indicating the bus is
released to an external device
Rev. 3.00 Mar 21, 2006 page 111 of 814
REJ09B0302-0300