Samsung S3C9228/P9228, 8-Bit CMOS Microcontroller user manual Port Data Registers

I/O PORTS S3C9228/P9228

PORT DATA REGISTERS

Table 9-2 gives you an overview of the register locations of all seven S3C9228 I/O port data registers. Data registers for ports 1, 2, 3, 4, 5, and 6 have the general format shown in Figure 9-1.

Table 9-2. Port Data Register Summary

Register Name	Mnemonic	Decimal	Hex	R/W
Port 0 data register	P0	228	E4H	R/W
Port 1 data register	P1	229	E5H	R/W
Port 2 data register	P2	230	E6H	R/W
Port 3 data register	P3	231	E7H	R/W
Port 4 data register	P4	232	E8H	R/W
Port 5 data register	P5	233	E9H	R/W
Port 6 data register	P6	234	EAH	R/W

MSB

S3C9228 I/O Port Data Register Format (n = 0-6)

.7 .6 .5 .4 .3 .2 .1 .0

LSB

Pn.7 Pn.6 Pn.5 Pn.4 Pn.3 Pn.2 Pn.1 Pn.0

Figure 9-1. S3C9228 I/O Port Data Register Format

9-2