H8S2245 datasheet(257/818 Pages) RENESAS

257 / 818 page

Section 8 I/O Ports

Rev.3.00 Mar. 26, 2007 Page 215 of 772

REJ09B0355-0300

• Modes 4 to 6

The corresponding port 1 pins are address outputs when P13DDR to P10DDR are set to 1, and

input ports when cleared to 0.

The corresponding port 1 pins are output ports when P17DDR to P14DDR are set to 1, and

input ports when cleared to 0.

Note:

Mode 6 cannot be used in the H8S/2240.

Port 1 Data Register (P1DR)

P17DR

R/W

P16DR

R/W

P15DR

R/W

P14DR

R/W

P13DR

R/W

P10DR

R/W

P12DR

R/W

P11DR

R/W

Bit

Initial value

R/W

P1DR is an 8-bit readable/writable register that stores output data for the port 1 pins (P1

7 to P10).

P1DR is initialized to H'00 by a power-on reset, and in hardware standby mode. It retains its prior

state after a manual reset, and in software standby mode.

Port 1 Register (PORT1)

P17

—*

P16

—*

P15

—*

P14

—*

P13

—*

P10

—*

P12

—*

P11

—*

Bit

Initial value

R/W

Note: * Determined by state of pins P17 to P10.

PORT1 is an 8-bit read-only register that shows the pin states. It cannot be written to. Writing of

output data for the port 1 pins (P1

7 to P10) must always be performed on P1DR.

If a port 1 read is performed while P1DDR bits are set to 1, the P1DR values are read. If a port 1

read is performed while P1DDR bits are cleared to 0, the pin states are read.

After a power-on reset and in hardware standby mode, PORT1 contents are determined by the pin

states, as P1DDR and P1DR are initialized. PORT1 retains its prior state after a manual reset, and

in software standby mode.

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