SH7014 Datasheet, PDF (486/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

16. Pin Function Controller (PFC)
Bit 0⎯PA0 Mode (PA0MD): Selects the function of the PA0/RxD0 pin.
Bit 0
PA0MD
0
1
Description
General input/output (PA0)
Receive data input (RxD0)
(initial value)
16.3.3 Port B I/O Register (PBIOR)
Bit: 15
14
13
12
11
10
9
8
⎯
⎯
⎯
⎯
⎯
⎯
PB9 PB8
IOR
IOR
Initial value: 0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R/W R/W
Bit: 7
6
5
4
3
2
1
0
PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0
IOR
IOR
IOR
IOR
IOR
IOR
IOR
IOR
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W R/W R/W* R/W*
Note: * R only in the SH7014.
The port B I/O register L (PBIOR) is a 16-bit read/write register that selects input or output for the
ten pins of port B (eight pins in the SH7014). Bits PB9IOR to PB0IOR correspond to the
PB9/IRQ7/A21 pin to PB0/A16 pin. PBIOR is enabled when the port B pins function as
input/outputs (PB9 to PB0). For other functions, it is disabled.
For port B pin functions PB9 to PB0, a given pin in port B is an output pin if its corresponding
PBIOR bit is set to 1, and an input pin if the bit is cleared to 0.
PBIOR is initialized to H'0000 by external power-on reset; however, it is not initialized for reset
by WDT, standby mode, or sleep mode, so the previous data is maintained.
The settings of bits 1 and 0 of PBIOR are functional only in the SH7016 and SH7017. In the
SH7014, there are no pins corresponding to these bits; they are always read as 0, and their write
value should always be 0.
Rev.5.00 Sep. 27, 2007 Page 452 of 716
REJ09B0398-0500