LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 137

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

To exit the configuration state, write one byte of AAH data to the CONFIG PORT. The LPC47N227 will
automatically deactivate the Configuration Access Ports following this procedure, at which point
configuration register access cannot occur until the configuration state is explicitly re-enabled.
Programming Example
The following is a configuration register programming example written in Intel 8086 assembly language.
;----------------------------.
; ENTER CONFIGURATION STATE
;----------------------------'
MOV
MOV
OUT
;----------------------------.
; CONFIGURE REGISTER CR0-CRx |
;----------------------------'
MOV
MOV
OUT
MOV
MOV
OUT
;
MOV
MOV
OUT
MOV
MOV
OUT
;
; Repeat for all CRx registers
;
;-----------------------------.
; EXIT CONFIGURATION STATE
;-----------------------------'
MOV
MOV
OUT
Configuration Select Register (CSR)
The Configuration Select Register can only be accessed when the LPC47N227 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.
DX,02EH
AX,055H
DX,AL
DX,02EH
AL,00H
DX,AL
DX,02FH
AL,3FH
DX,AL
DX,02EH
AL,01H
DX,AL
DX,02FH
AL,9FH
DX,AL
DX,02EH
AX,AAH
DX,AL
;SYSOPT = 0
;Point to CR0
;Update CR0
;Point to CR1
;Update CR1
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