PSD501B1 datasheet(45/153 Pages) STMICROELECTRONICS

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PSD5XX Family

9.3.10 Port Registers

There are two sets of registers per I/O port: the Port Configuration Registers (PCR) which

consist of four 8-bit registers; and the Port Data Registers (PDR) which include three 8-bit

registers. The PCR is used for setting up the port configuration, while the PDR enables the

microcontroller to write or read port data or status bits. Tables 12 and 13 show the names

and the registers and the ports to which they belong.

All the registers in the PCR and PDR are 8-bits wide and each bit is associated with a pin in

the I/O port. In Table 14, the LSB of the Data In Register of Port A is connected to pin PA0,

and the MSB is connected to PA7. This pin configuration also applies to other registers and

ports. For example, in the Direction Register of Port A, writing a hex value of 07 to the

Registers can be accessed by the microcontroller during normal read/write bus cycles.

The I/O address offset of the registers are listed in the System Configuration section.

I/O Ports

(Cont.)

Port

Write/Read

Control Register

A,B,C,D,E

Write/Read

Direction Register

A,B,C,D,E

Write/Read

Open Drain Register

C,D

Write/Read

Special Function Register

A,B,E

Write/Read

PLD – I/O Register

A,B,E

Read

Table 12. Port Configuration Registers (PCR)

Port

Read/Write

Data In Register

A,B,C,D,E

Read

Data Out Register

A,B,C,D,E

Write/Read

Macrocell Out Register

A,B,E

Read

Table 13. Port Data Registers (PDR)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PA7 Pin

PA6 Pin

PA5 Pin

PA4 Pin

PA3 Pin

PA2 Pin

PA1 Pin

PA0 Pin

Table 14.

Data In Register – Port A

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PA7 Pin

PA6 Pin

PA5 Pin

PA4 Pin

PA3 Pin

PA2 Pin

PA1 Pin

PA0 Pin

= 0

= 1

Direction Register – Port A

( Example: Pins PA0 – PA2 as Output, PA3 – PA7 as Input)

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