3069RF-ZTAT Datasheet, PDF (305/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Table 8.14 Port 8 Pin Functions in Modes 1 to 5
Pin
P8 /CS
4
0
P8 /CS /IRQ /ADTRG
3
1
3
P8 /CS /IRQ
2
2
2
P8 /CS /IRQ
1
3
1
P8 /RFSH/IRQ
0
0
Pin Functions and Selection Method
Bit P8 DDR selects the pin function as follows.
4
P8 DDR
0
4
Pin function
P8 input
4
Bit P8 DDR selects the pin function as follows.
3
P8 DDR
0
3
Pin function
P8 input
3
1
CS output
0
IRQ input
3
ADTRG input
1
CS output
1
The DRAM interface settings by bits DRAS2 to DRAS0 in DRCRA, and bit P82DDR, select the
pin function as follows.
DRAM interface
settings
(1) in table below
|(2) in table below
P8 DDR
2
Pin function
0
P8 input
2
Note:
*
CS
2
is
output
as
RAS .
2
DRAM interface
setting
(1)
1
CS output
2
IRQ input
3
—
CS output*
2
(2)
DRAS2
0
1
DRAS1
0
1
0
1
DRAS0
0
1
0
1
0
1
0
1
The DRAM interface settings by bits DRAS2 to DRAS0 in DRCRA, and bit P81DDR, select the
pin function as follows.
DRAM interface
settings
(1) in table below
(2) in table below
(3) in table below
P8 DDR
1
Pin function
0
1
0
1
P81 input CS3 output P81 input P81 output
pin
pin
pin
pin
—
CS output pin*
3
IRQ input pin
1
Note: * CS is output as RAS .
3
3
DRAM interface
setting
(1)
(3)
(2)
(3)
(2)
DRAS2
0
1
DRAS1
0
1
0
1
DRAS0
0
1
0
1
0
1
0
1
Bit RFSHE in DRCRA and bit P80DDR select the pin function as follows.
RFSHE
0
1*
P8 DDR
0
1
—
0
Pin function
P8 input
0
P8 output
0
RFSH output
IRQ input
0
Note: * If areas 2 to 5 are not designated as DRAM space, this bit should not be set to 1.
Rev. 5.0, 09/04, page 283 of 978