VSC056KM datasheet(15/134 Pages) MAXIM

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VSC056

Data Sheet

Revision 4.1

January 2008

3Registers

This section contains descriptions for the device-specific control registers. All register locations are fixed

within the device and are mapped for easy access, as well as for future enhancements.

3.1

Control Registers

The control register section is separated into three sub-sections: a register map, an address map, and bit

level descriptions of all registers. The register map lists all registers by operating address. The address map

shows the relative layout of all control registers.

Although all registers can be accessed at any time and no register function interferes with the operation of

the serial interface, changing register bits does have an immediate effect on the respective I/O lines.

The following table provides the mapping of the registers.

Table 2. Register Map

Data Memory

Address

Access

Label

Description

00h

R/W

GPD0

General-Purpose I/O Port 0 Data Register

01h

R/W

GPD1

General-Purpose I/O Port 1 Data Register

02h

R/W

GPD2

General-Purpose I/O Port 2 Data Register

03h

R/W

GPD3

General-Purpose I/O Port 3 Data Register

04h

R/W

GPD4

General-Purpose I/O Port 4 Data Register

05h

R/W

GPD5

General-Purpose I/O Port 5 Data Register

06h

R/W

GPD6

General-Purpose I/O Port 6 Data Register

07h

R/W

GPD7

General-Purpose I/O Port 7 Data Register

10h

R/W

DDP0

I/O Port 0 Data Direction Register

11h

R/W

DDP1

I/O Port 1 Data Direction Register

12h

R/W

DDP2

I/O Port 2 Data Direction Register

13h

R/W

DDP3

I/O Port 3 Data Direction Register

14h

R/W

DDP4

I/O Port 4 Data Direction Register

15h

R/W

DDP5

I/O Port 5 Data Direction Register

16h

R/W

DDP6

I/O Port 6 Data Direction Register

17h

R/W

DDP7

I/O Port 7 Data Direction Register

20h

R/W

PBC0

Port Bypass Control 0 Register

21h

R/W

PBC1

Port Bypass Control 1 Register

22h

R/W

PBC2

Port Bypass Control 2 Register

23h

R/W

PBC3

Port Bypass Control 3 Register

24h

R/W

PBC4

Port Bypass Control 4 Register

25h

R/W

PBC5

Port Bypass Control 5 Register

26h

R/W

PBC6

Port Bypass Control 6 Register

27h

R/W

PBC7

Port Bypass Control 7 Register

28h

R/W

PBC8

Port Bypass Control 8 Register

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