LPC47M14X datasheet(153/205 Pages) SMSC

153 / 205 page

SMSC DS – LPC47M14X

Page 153

Rev. 03/19/2001

CONFIGURATION SEQUENCE

To program the configuration registers, the following sequence must be followed:

1) Enter Configuration Mode

2) Configure the Configuration Registers

3) Exit Configuration Mode.

Enter Configuration Mode

To place the chip into the Configuration State the Config Key is sent to the chip's CONFIG PORT. The config key

consists of 0x55 written to the CONFIG PORT. Once the configuration key is received correctly the chip enters into the

Configuration State (The auto Config ports are enabled).

Configuration Mode

The system sets the logical device information and activates desired logical devices through the INDEX and DATA ports.

In configuration mode, the INDEX PORT is located at the CONFIG PORT address and the DATA PORT is at INDEX

PORT address + 1.

The desired configuration registers are accessed in two steps:

a) Write the index of the Logical Device Number Configuration Register (i.e., 0x07) to the INDEX PORT and then write

the number of the desired logical device to the DATA PORT

b) Write the address of the desired configuration register within the logical device to the INDEX PORT and then write or

read the configuration register through the DATA PORT.

Note: If accessing the Global Configuration Registers, step (a) is not required.

Exit Configuration Mode

To exit the Configuration State the system writes 0xAA to the CONFIG PORT. The chip returns to the RUN State.

Note: Only two states are defined (Run and Configuration). In the Run State the chip will always be ready to enter the

Configuration State.

Programming Example

The following is an example of a configuration program in Intel 8086 assembly language.

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

; ENTER CONFIGURATION MODE |

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

MOV

DX,02EH

MOV

AX,055H

OUT

DX,AL

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

; CONFIGURE REGISTER CRE0, |

; LOGICAL DEVICE 8

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

MOV

DX,02EH

MOV

AL,07H

OUT

DX,AL ;Point to LD# Config Reg

MOV

DX,02FH

MOV

AL, 08H

OUT

DX,AL;Point to Logical Device 8

;

MOV

DX,02EH

MOV

AL,E0H

OUT

DX,AL

; Point to CRE0

MOV

DX,02fH

MOV

AL,02H

OUT

DX,AL

; Update CRE0

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

; EXIT CONFIGURATION MODE

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

MOV

DX,02EH

MOV

AX,0AAH

OUT

DX,AL

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