HD64F2149YV datasheet(246/1075 Pages) RENESAS

246 / 1075 page

Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 218 of 1044

REJ09B0280-0300

Port 3 Data Register (P3DR)

P37DR

R/W

P36DR

R/W

P35DR

R/W

P34DR

R/W

P33DR

R/W

P30DR

R/W

P32DR

R/W

P31DR

R/W

Bit

Initial value

Read/Write

P3DR is an 8-bit readable/writable register that stores output data for the port 3 pins (P37 to P30).

If a port 3 read is performed while P3DDR bits are set to 1, the P3DR values are read directly,

regardless of the actual pin states. If a port 3 read is performed while P3DDR bits are cleared to 0,

the pin states are read.

P3DR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in

software standby mode.

Port 3 MOS Pull-Up Control Register (P3PCR)

P37PCR

R/W

P36PCR

R/W

P35PCR

R/W

P34PCR

R/W

P33PCR

R/W

P30PCR

R/W

P32PCR

R/W

P31PCR

R/W

Bit

Initial value

Read/Write

P3PCR is an 8-bit readable/writable register that controls the port 3 built-in MOS input pull-ups

on a bit-by-bit basis.

In modes 2 and 3 (when EXPE = 0), the MOS input pull-up is turned on when a P3PCR bit is set

to 1 while the corresponding P3DDR bit is cleared to 0 (input port setting).

P3PCR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in

software standby mode.

The MOS input pull-up function cannot be used when the host interface is enabled.

HD64F2149YV 数据表(PDF) 246 Page - Renesas Technology Corp

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