HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 478

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 16 I/O Ports (I/O)
16.4.2
PCDR is an 16-bit read-only register that stores data for port C (writes to bits 15–8 are ignored,
and the read value is always undefined). Bits PC7DR–PC0DR correspond to the PC7/AN7–
PC0/AN0 pins respectively. Any values written to these bits will be ignored and will not affect the
pin status. When the bits are read, the pin status rather than the bit value is read directly. When
analog input of the A/D converter is being sampled, however, every bit is read as 1. Table 16.6
shows port C data register read/write operations (bits 7–0).
PCDR is not initialized by a power-on reset or manual reset, or in standby mode or sleep mode
(bits 15–8 are always undefined; bits 7–0 always reflect the pin status).
Table 16.6 Port C Data Register (PCDR) Read/Write Operations
Pin I/O
Input
ANn: Analog input
Rev. 7.00 Jan 31, 2006 page 452 of 658
REJ09B0272-0700
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Port C Data Register (PCDR)
Pin Function
General
purpose
ANn
PC7DR PC6DR PC5DR PC4DR PC3DR PC2DR PC1DR PC0DR
15
—
—
—
R
R
7
Read
Pin status read
Read as 1
14
—
—
—
R
R
6
13
—
—
—
R
R
5
Write
Ignored (no effect on pin status)
Ignored (no effect on pin status)
12
—
—
—
R
R
4
11
—
—
—
R
R
3
10
—
—
—
R
R
2
—
—
—
R
R
9
1
—
—
—
R
R
8
0