SIO1007 datasheet(58/108 Pages) MICROCHIP

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SIO1007

DS00002020A-page 58

 2005 - 2015 Microchip Technology Inc.

18.2.2

CONFIGURATION REGISTER PROGRAMMING

The SIO1007 contains configuration registers CR00-CR39. After the SIO1007 enters the configuration state, configura-

tion registers can be programmed by first writing the register index number (00 - 39H) to the Configuration Select Reg-

ister (CSR) through the INDEX PORT and then writing or reading the configuration register contents through the DATA

PORT. Configuration register access remains enabled until the configuration state is explicitly exited.

18.2.3

EXITING THE CONFIGURATION STATE

To exit the configuration state, write one byte of AAH data to the CONFIG PORT. The SIO1007 will automatically deac-

tivate the Configuration Access Ports following this procedure, at which point configuration register access cannot occur

until the configuration state is explicitly re-enabled.

18.2.4

PROGRAMMING EXAMPLE

The following is a configuration register programming example written in Intel 8086 assembly language.

;----------------------------.

; ENTER CONFIGURATION STATE

;----------------------------'

MOVDX,02EH;SYSOPT = 0

MOVAX,055H

OUTDX,AL

;----------------------------.

; CONFIGURE REGISTER CR0-CRx |

;----------------------------'

MOVDX,02EH

MOVAL,00H

OUTDX,AL ;Point to CR0

MOVDX,02FH

MOVAL,3FH

OUTDX,AL ;Update CR0

;

MOVDX,02EH

MOVAL,01H

OUTDX,AL ;Point to CR1

MOVDX,02FH

MOVAL,9FH

OUTDX,AL ;Update CR1

;

; Repeat for all CRx registers

;

;-----------------------------.

; EXIT CONFIGURATION STATE

;-----------------------------'

MOVDX,02EH

MOVAX,AAH

OUTDX,AL

18.2.5

CONFIGURATION SELECT REGISTER (CSR)

The Configuration Select Register can only be accessed when the SIO1007 is in the configuration state. The CSR is

located at the INDEX PORT address and must be initialized with configuration register index before the register can be

accessed using the DATA PORT.

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