HD64F7047F50 Datasheet, PDF (582/766 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

When a pin functions is a 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 18.2 summarizes port B data register read/write operations.
Bit
Bit Name Initial Value R/W
15 to 6 —
All 0
R
5
PB5DR 0
R/W
4
PB4DR 0
R/W
3
PB3DR 0
R/W
2
PB2DR 0
R/W
1
PB1DR 0
R/W
0
PB0DR 0
R/W
Description
Reserved
These bits are always read as 0, and should only be
written with 0.
See table 18.2
Table 18.2 Port B Data Register (PBDR) Read/Write Operations
Bits 5 to 0:
PBIOR
0
1
Pin Function
General input
Other than
general input
General output
Other than
general output
Read
Pin state
Pin state
PBDR value
PBDR value
Write
Can write to PBDR, but it has no effect on pin state
Can write to PBDR, but it has no effect on pin state
Value written is output from pin
Can write to PBDR, but it has no effect on pin state
Rev. 2.00, 09/04, page 540 of 720