SH7146 Datasheet, PDF (775/1022 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 18 I/O Ports
18.5.1 Register Descriptions
Port F is a 12-bit input-only port. Port F has the following register. For details on register
addresses and register states during each processing, refer to section 23, List of Registers.
Table 18.9 Register Configuration
Register Name
Port F data register L
Abbrevia-
tion
R/W Initial Value Address
Access Size
PFDRL
R
H'xxxx
H'FFFFD382 8, 16
18.5.2 Port F Data Register L (PFDRL)
The port F data register L (PFDRL) is a 16-bit read-only register that stores port F data. Bits
PF15DR to PF8DR, PF6DR, PF4DR, PF2DR, and PF0DR correspond to pins PF15 to PF8, PF6,
PF4, PF2, and PF0, respectively (multiplexed functions omitted here).
Any value written into these bits is ignored, and there is no effect on the state of the pins. When
any of the bits are read, the pin state rather than the bit value is read directly. However, when an
A/D converter analog input is being sampled, values of 1 are read out. Table 18.10 summarizes
port F data register L read/write operations.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
PF15 PF14 PF13 PF12 PF11 PF10 PF9 PF8
DR DR DR DR DR DR DR DR
-
PF6
DR
-
PF4
DR
-
PF2
DR
-
PF0
DR
Initial value: *
*
*
*
*
*
*
*
0
*
0
*
0
*
0
*
R/W: R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Rev. 3.00 May 17, 2007 Page 731 of 974
REJ09B0229-0300