W7100A datasheet(49/160 Pages) WIZNET

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W7100A Datasheet v1.2.5

P2 (0xA0)

Reset

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2

P2.1

P2.0

0xFF

Figure 4.4 Port2 Register

P3 (0xB0)

Reset

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

0xFF

Figure 4.5 Port3 Register

Read and write accesses are performed in the I/O ports via their corresponding SFR: P0

(0x80), P1 (0x90), P2 (0xA0), and P3 (0xB0). Some port-reading instructions read from the

data registers while others read from the port pin. The “Read-Modify-Write” instructions are

directed to the data registers as shown below.

Table 4.2 Read-Modify-Write Instructions

Instruction

Function Description

ANL

Logic AND

ORL

Logic OR

XRL

Logic exclusive OR

JBC

Jump if bit is set and cleared

CPL

Complement bit

INC, DEC

Increment, decrement byte

DJNZ

Decrement and jump if not zero

MOV Px.y, C

Move carry bit to bit y of port x

CLR Px.y

Clear bit y of port x

SETB Px.y

Set bit y of port x

All other instructions read from a port exclusively through the port pins. All ports pin can be

used as GPIO (General Purpose Input Output). The GPIO of W7100A is shown in the Figure

below. The output driving voltage of GPIO is 0V or 3.3V according to the Px_PD/PU SFR value

or GPIO keeps its previous value in current operation mode.

Px_PU

Px_PD

Status

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