LPC47M14X datasheet(90/205 Pages) SMSC

90 / 205 page

SMSC DS – LPC47M14X

Page 90

Rev. 03/19/2001

Table 45a – Extended Control Register

R/W

MODE

000:

Standard Parallel Port Mode . In this mode the FIFO is reset and common collector drivers are

used on the control lines (nStrobe, nAutoFd, nInit and nSelectIn). Setting the direction bit will

not tri-state the output drivers in this mode.

001:

PS/2 Parallel Port Mode. Same as above except that direction may be used to tri-state the

data lines and reading the data register returns the value on the data lines and not the value in

the data register. All drivers have active pull-ups (push-pull).

010:

Parallel Port FIFO Mode. This is the same as 000 except that bytes are written or DMAed to the

FIFO. FIFO data is automatically transmitted using the standard parallel port protocol. Note that

this mode is only useful when direction is 0. All drivers have active pull-ups (push-pull).

011:

ECP Parallel Port Mode. In the forward direction (direction is 0) bytes placed into the ecpDFifo

and bytes written to the ecpAFifo are placed in a single FIFO and transmitted automatically to

the peripheral using ECP Protocol. In the reverse direction (direction is 1) bytes are moved

from the ECP parallel port and packed into bytes in the ecpDFifo. All drivers have active

pull-ups (push-pull).

100:

Selects EPP Mode: In this mode, EPP is selected if the EPP supported option is selected in

configuration register L3-CRF0. All drivers have active pull-ups (push-pull).

101:

Reserved

110:

Test Mode. In this mode the FIFO may be written and read, but the data will not be transmitted

on the parallel port. All drivers have active pull-ups (push-pull).

111:

Configuration Mode. In this mode the confgA, confgB registers are accessible at 0x400 and

0x401. All drivers have active pull-ups (push-pull).

Table 45B

Table 45C

IRQ SELECTED

CONFIG REG B

BITS 5:3

DMA

SELECTED

CONFIG REG B

BITS 2:0

110

011

101

010

100

001

011

All Others

000

010

001

111

All Others

000

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