Datasheet

Section 10 I/O Ports
Page 572 of 1384 R01UH0310EJ0500 Rev. 5.00
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
10.3.5 Pin Functions
Port 3 pins also function as the pins for SCI I/Os, I
2
C I/Os, and bus control signal outputs. The
correspondence between the register specification and the pin functions is shown below.
• P35/OE-B*
3
/CKE-B*
2
/SCK1/SCL0
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit ICE in ICCRA_0 of the I
2
C, bit C/A in SMR_1 and bits CKE0 and CKE1
in SCR_1 of the SCI, bits OEE and RMTS2 to RMTS0 in DRAMCR*
3
of the bus controller,
bit OES in PFCR2, and bit P35DDR.
• Modes 1, 2, and 4 Modes 3 and 7 (EXPE = 1)
OEE 0 1
OES ⎯ 1 0
RMTS2
to
RMTS0
⎯ ⎯ Any of
areas 2
to 5 is
DRAM
space
Areas 2
to 5 are
continu-
ous
SDRAM
space
ICE 0 1 0 1 ⎯
CKE1 0 1 ⎯ 0 1 ⎯ ⎯
C/A 0 1 ⎯ ⎯ 0 1 ⎯ ⎯ ⎯
CKE0 0 1 ⎯ ⎯ ⎯ 0 1 ⎯ ⎯ ⎯ ⎯
P35DDR 0 1 ⎯ ⎯ ⎯ ⎯ 0 1 ⎯ ⎯ ⎯ ⎯ ⎯
Pin
function
P35
input
P35
output
SCK1
output
SCK1
output
SCK1
input
SCL0
I/O*
1
P35
input
P35
output
SCK1
output
SCK1
output
SCK1
input
SCL0
I/O*
1
OE-B
output*
3
CKE-B
output*
2