r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 616

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

Section 10 I/O Ports
SSUMS
BIDE
MSS
TE
RE
Pin
state
Legend:
: Pin is not used by the SSU (can be used as I/O port)
• PA5/A21/IRQ5-A/SSCK0-B
• Modes 1, 2, and 4
A21E
SSU settings
PA5DDR
Pin function
Rev. 1.00 Sep. 19, 2008 Page 586 of 1342
REJ09B0467-0100
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bits MSS and SCKS in SSCRH and bit SSUMS in SSCRL of SSU, bit A21E
in PFCR1, bits SSCK0S1 and SSCK0S0 in PFCR5, bit PA5DDR, and bit ITS5 in ITSR of the
interrupt controller
 Output Output Input 
0
1
0
0
PA5 input
1
1
Can be used as
0
0
0
I/O port
0
1
PA5 output
0
1
1
1
Input
1
0

0
1
IRQ5-A interrupt input*
SSCK0-B
SSI pin settings
input*
0
Input
state
SSCK0-B input*

0
1
0
0
1
2

0
1
Output state
1
SSCK0-B
output*

1
0

Input
2
0
1
3
1

0
0
PA5 input
1
Input Input
0
1
1
0

0
1
1
A21 output

1
0
1
1
Input
1