H8S-2172 Datasheet, PDF (117/570 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2100 Series

6.2 Input/Output Pins
Table 6.1 shows the pin configuration of the bus controller.
Table 6.1 Pin Configuration
Name
Address strobe
Symbol
AS
Read
High write
RD
HWR
Low write
LWR
Chip select 0
CS0
Chip select 1
CS1
Chip select 2/
row address strobe
Chip select 3
CS2/
RAS
CS3
Upper column address strobe UCAS
Lower column address strobe LCAS
Data transfer acknowledge 3
(DMAC)
Data transfer acknowledge 2
(DMAC)
Data transfer acknowledge 1
(DMAC)
Data transfer acknowledge 0
(DMAC)
DACK3
DACK2
DACK1
DACK0
I/O
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Function
Strobe signal indicating that normal space
is accessed and address output on
address bus is enabled.
Strobe signal indicating that normal space
is being read.
Strobe signal indicating that normal space
is written to, and upper half (D15 to D8) of
data bus is enabled.
Strobe signal indicating that normal space
is written to, and lower half (D7 to D0) of
data bus is enabled.
Strobe signal indicating that area 0 is
selected.
Strobe signal indicating that area 1 is
selected
Strobe signal indicating that area 2 is
selected/DRAM row address strobe signal
Strobe signal indicating that area 3 is
selected.
16-bit DRAM space upper column address
strobe signal or 8-bit DRAM space column
address strobe signal
16-bit DRAM space lower column address
strobe signal
Data transfer acknowledge signal for single
address transfer by DMAC channel 3.
Data transfer acknowledge signal for single
address transfer by DMAC channel 2.
Data transfer acknowledge signal for single
address transfer by DMAC channel 1.
Data transfer acknowledge signal for single
address transfer by DMAC channel 0.
Rev. 2.00, 03/04, page 85 of 534