MB95F613K datasheet(37/110 Pages) CYPRESS

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Document Number: 002-04698 Rev. *A

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PRELIMINARY

MB95610H Series

15.1.3 Port 0 registers

■ Port 0 register functions

■ Correspondence between registers and pins for port 0

15.1.4 Port 0 operations

■ Operation as an output port

❐ A pin becomes an output port if the bit in the DDR0 register corresponding to that pin is set to “1”.

❐ For a pin shared with other peripheral functions, disable the output of such peripheral functions.

❐ When a pin is used as an output port, it outputs the value of the PDR0 register to external pins.

❐ If data is written to the PDR0 register, the value is stored in the output latch and is output to the pin set as an output port as it is.

❐ Reading the PDR0 register returns the PDR0 register value.

❐ To use a pin shared with the LCDC as an output port, set a corresponding function select bit (SEG[35:32]) in the LCDC enable

register 7 (LCDCE7) to “0” to select the general-purpose I/O port function, and then set the port input control bit (PICTL) in the

LCDC enable register 1 (LCDCE1) to “1”.

■ Operation as an input port

❐ A pin becomes an input port if the bit in the DDR0 register corresponding to that pin is set to “0”.

❐ For a pin shared with other peripheral functions, disable the output of such peripheral functions.

❐ When using an analog input shared pin as an input port, set the corresponding bit in the A/D input disable register (lower) (AIDRL)

to “1”.

❐ If data is written to the PDR0 register, the value is stored in the output latch but is not output to the pin set as an input port.

❐ Reading the PDR0 register returns the pin value. However, if the read-modify-write (RMW) type of instruction is used to read the

PDR0 register, the PDR0 register value is returned.

❐ To use a pin shared with the LCDC as an input port, set a corresponding function select bit (SEG[35:32]) in the LCDCE7 register

to “0” to select the general-purpose I/O port function, and then set the PICTL bit in the LCDCE1 register to “1”.

■ Operation as a peripheral function output pin

❐ A pin becomes a peripheral function output pin if the peripheral output function is enabled by setting the output enable bit of a

peripheral function corresponding to that pin.

❐ The pin value can be read from the PDR0 register even if the peripheral function output is enabled. Therefore, the output value

of a peripheral function can be read by the read operation on the PDR0 register. However, if the read-modify-write (RMW) type

of instruction is used to read the PDR0 register, the PDR0 register value is returned.

abbreviation

Data

Read

Read by read-modify-write

(RMW) instruction

Write

PDR0

Pin state is “L” level.

PDR0 value is “0”.

As output port, outputs “L” level.

Pin state is “H” level.

PDR0 value is “1”.

As output port, outputs “H” level.

DDR0

Port input enabled

Port output enabled

AIDRL

Analog input enabled

Port input enabled

Correspondence between related register bits and pins

Pin name

P07

P06

P05

P04

P03

P02

P01

P00

PDR0

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

DDR0

AIDRL

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