Datasheet

Section 9 I/O Ports
Rev.6.00 Sep. 27, 2007 Page 351 of 1268
REJ09B0220-0600
Port Description Pins Mode 4
*
1
Mode 5
*
1
Mode 6 Mode 7
Port F • 8-bit I/O
port
PF
1
/BACK
PF
0
/BREQ
When BRLE = 0 (after reset): I/O port
When BRLE = 1: BREQ input, BACK output
I/O ports
Port G • 5-bit I/O
port
PG
4
/CS
0
When DDR = 0
*
3
: input port
When DDR = 1
*
4
: CS0 output
I/O ports
PG
3
/CS
1
When DDR = 0 (after reset): input port
When CS167E = 0 and DDR = 1: output port
When CS167E = 1 and DDR = 1: CS1
output
PG
2
/CS
2
When DDR = 0 (after reset): input port
When CS25E = 0 and DDR = 1: output port
When CS25E = 1 and DDR = 1: CS2 output
PG
1
/CS
3
When DDR = 0 (after reset): input port
When CS25E = 0 and DDR = 1: output port
When CS25E = 1 and DDR = 1: CS3 output
PG
0
/CAS
*
2
DRAM space set: CAS output
Otherwise (after reset): I/O port
Notes: 1. Only modes 4 and 5 are provided in the ROMless version.
2. The DACK1, DACK0, TEND1, DREQ1, TEND0, DREQ0 and LCAS are not supported
in the H8S/2321.
3. After a reset in mode 6.
4. After a reset in mode 4 or 5.