Datasheet

Section 10 I/O Ports
R01UH0309EJ0500 Rev. 5.00 Page 679 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
10.16.5 Pin Functions
Port H pins also function as bus control signal I/Os and interrupt inputs. The correspondence
between the register specification and the pin functions is shown below.
• PH3/CS7/OE-A/CKE-A*
2
/IRQ7-B
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit OEE of the bus controller, bit OES in PFCR2, bit CS7E in PFCR0, and bit
PH3DDR.
• Modes 1, 2, and 4 Modes 3 and 7 (EXPE = 1)
OEE 0 1
OES ⎯ 0 1
RMTS2 to
RMTS0
⎯ ⎯ Any of
areas 2 to
5 is
DRAM
space
Areas 2 to
5 are syn-
chronous
DRAM
space
CS7E 0 1 0 1 ⎯ ⎯
PH3DDR 0 1 0 1 0 1 0 1 ⎯ ⎯
PH3
input
PH3
output
PH3
input
CS7
output
PH3
input
PH3
output
PH3
input
CS7
output
OE-A
output
CKE-A*
2
output
Pin
function
IRQ7-B input*
1
• Modes 3 and 7 (EXPE = 0)
OEE ⎯
OES ⎯
RMTS2 to RMTS0 ⎯
CS7E ⎯
PH3DDR 0 1
PH3 input PH3 output Pin function
IRQ7-B input*
1
Notes: 1. IRQ7-B input when the ITS7 bit in ITSR is 1.
2. Not supported in the H8S/2456 Group.