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Section 32 General Purpose I/O Ports
Page 1692 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name Initial Value R/W Description
9, 8 PB22MD[1:0] 00 R/W PB22 Mode
Select the function of the PB22.
00: PB22
01: A22
10: CS4
11: Setting prohibited
7, 6 All 0 R Reserved
These bits are always read as 0. The write value
should always be 0.
5, 4 PB21MD[1:0] 00 R/W PB21 Mode
Select the function of the PB21.
00: PB21
01: A21
10: SPDIF_OUT (640-Kbyte version only)
11: Setting prohibited
Note: For 1-Mbyte version, bit 5 is reserved and
always read as 0. The write value should
always be 0.
3, 2 All 0 R Reserved
These bits are always read as 0. The write value
should always be 0.
1, 0 PB20MD[1:0] 00/01 R/W PB20 Mode
Select the function of the PB20.
Boot mode 0
00: Setting prohibited
01: A20 (initial value)
10: Setting prohibited
11: Setting prohibited
Boot mode 1 to 3
00: PB20 (initial value)
01: A20
10: SPDIF_IN (640-Kbyte version only)
11: Setting prohibited
Note: For 1-Mbyte version, bit 1 is reserved and
always read as 0. The write value should
always be 0.