HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 175

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.1.3
Table 6.1 summarizes the pins of the bus controller.
Table 6.1
Name
Address strobe
Read
High write
Low write
Chip select 0
Chip select 1
Chip select 2
Chip select 3
Wait
Bus request
Bus request acknowledge
Bus request output
Pin Configuration
Bus Controller Pins
Symbol
AS
RD
HWR
LWR
CS0
CS1
CS2
CS3
WAIT
BREQ
BACK
BREQO
I/O
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Output
Output
Function
Strobe signal indicating that address output on
address bus is enabled.
Strobe signal indicating that external space is
being read.
Strobe signal indicating that external space is
to be written, and upper half (D
bus is enabled.
Strobe signal indicating that external space is
to be written, and lower half (D
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.
Strobe signal indicating that area 3 is selected.
Wait request signal when accessing external
3-state access space.
Request signal that releases bus to external
device.
Acknowledge signal indicating that bus has
been released.
External bus request signal used when
internal bus master accesses external space
when external bus is released.
Rev.3.00 Mar. 26, 2007 Page 133 of 772
Section 6 Bus Controller
REJ09B0355-0300
7
15
to D
to D
0
) of data
8
) of data