SH7206 Datasheet, PDF (978/1188 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 20 I/O Ports
20.3.2 Port B Data Register (PBDR)
PBDR is a 16-bit readable/writable register that stores port B data. Bits PB9DR and PB5DR to
PB2DR correspond to pins PB9/IRQ7/A21/ADTRG/POE8 and PB5/IRQ3/POE3/CASL to
PB2/IRQ0/POE0/SCL, respectively.
When a pin function is general output, if a value is written to PBDR, that value is output directly
from the pin, and if PBDR is read, the register value is returned directly regardless of the pin state.
When a pin function is general input, if PBDR is read, the pin state, not the register value, is
returned directly. If a value is written to PBDR, although that value is written into PBDR, it does
not affect the pin state. Table 20.4 summarizes PBDR read/write operations.
PBDR is initialized to the value shown in table 20.3 by a power-on reset. PBDR is not initialized
by a manual reset or in sleep mode or software standby mode.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
-
-
-
-
-
-
PB9
DR
-
-
-
PB5 PB4 PB3 PB2
DR DR DR DR
-
-
Initial value: 0
0
0
0
0
0
0
-
-
-
0
0
*
*
-
-
R/W: R
R
R
R
R
R R/W R
R
R R/W R/W R
R
R
R
Note: * Depends on the external pin state.
Initial
Bit
Bit Name Value R/W
15 to 10 —
All 0
R
9
PB9DR 0
R/W
8 to 6 

R
5
PB5DR 0
R/W
4
PB4DR 0
R/W
3
PB3DR Pin state R
2
PB2DR Pin state R
1, 0


R
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
See table 20.4
Reserved
These bits are always read as undefined values. The
write value should always be 0.
See table 20.4
Reserved
These bits are always read as undefined values. The
write value should always be 0.
Rev. 3.00 Jun. 18, 2008 Page 954 of 1160
REJ09B0191-0300