r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 250

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
6.7.4
Table 6.7 shows the pins used for DRAM interfacing and their functions. Since the CS2 to CS5
pins are in the input state after a reset, set the corresponding DDR to 1 when RAS2 to RAS5
signals are output.
Table 6.7
Rev. 1.00 Sep. 19, 2008 Page 220 of 1342
REJ09B0467-0100
Pin
HWR
CS2
CS3
CS4
CS5
UCAS
LCAS
RD, OE
WAIT
A15 to A0
D15 to D0
Pins Used for DRAM Interface
DRAM Interface Pins
With DRAM
Setting
WE
RAS2/RAS
RAS3
RAS4
RAS5
UCAS
LCAS
OE
WAIT
A15 to A0
D15 to D0
Name
Write enable
Row address strobe 2/
row address strobe
Row address strobe 3
Row address strobe 4
Row address strobe 5
Upper column address
strobe
Lower column address
strobe
Output enable
Wait
Address pins
Data pins
I/O
Output
Output
Output
Output
Output
Output
Output
Output
Input
Output
I/O
Function
Write enable for DRAM space
access
Row address strobe when area
2 is designated as DRAM space
or row address strobe when
areas 2 to 5 are designated as
continuous DRAM space
Row address strobe when area
3 is designated as DRAM space
Row address strobe when area
4 is designated as DRAM space
Row address strobe when area
5 is designated as DRAM space
Upper column address strobe for
16-bit DRAM space access or
column address strobe for 8-bit
DRAM space access
Lower column address strobe
signal for 16-bit DRAM space
access
Output enable signal for DRAM
space access
Wait request signal
Row address/column address
multiplexed output
Data input/output pins