PC97338 datasheet(216/221 Pages) NSC

216 / 221 page

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Appendix A

Comparison of PC87338 and PC97338

** In the PC87338 and PC97338, BOUT1 is multiplexed with SOUT1; BOUT2 is multiplexed with DRT2.

Module

PC87338

PC97338

Configuration

Updating a Configuration Register

requires two consecutive write

accesses to the Data Register, and

the CPU interrupts must be disabled

during the write cycle.

Updating a Configuration Register

requires a single write to the Data

need to be disabled.

The MIDI baud rate (pre-scale of 12

instead of 13) is configured by TUP3

as follows:

TUP3: 0 - Pre-scale divides the

clock by 13

TUP3: 1 - Pre-scale divides the

clock by 12 (for MIDI)

TUP3 is reserved. Programming the

UART to MIDI baud rate is

accomplished by programming the pre-

scale to 1, and the baud rate divisor to

a number that is 12 times its value in

the PC87338.

SuperI/O Chip Configuration Register

2 (SCF2) bit 4 is reserved:

Bit 4: Reserved

SuperI/O Chip Configuration Register 2

(SCF2) bit 4 value is:

Bit 4: SCC1 Bank Select Enable

No Manufacturing Test Register.

Includes a new register, the

Manufacturing Test Register (MTEST),

Index 52h.

FDC

No FM mode support.

Supports FM mode.

NPP

The output of the control signals are

at level 2 (push-pull) in:

- EPP1.9 mode

- ECP mode 011

- ECP mode 010 and PCR[1]=1

The output of the control signal are at

level 2 (push-pull) in:

- EPP mode

- All ECP modes except 000

DCR5 is a read only bit (return 0) in

ECP modes 000 and 010. In all other

ECP modes, DCR5 is a read/write bit.

DCR5 is a read/write bit in all ECP

modes.

CTR2 is 0 after reset (activate INIT

signal to initialize the printer).

CTR2 is 1 after reset, so the printer

remains in ECP mode if it was

programmed to this mode and not

initialized to SPP mode.

UART** and IR

The baud rate generator is not

initialized on power-up.

MR signal resets the baud rate

generator register on power-up.

In loopback mode, the data is not

projected on SOUT1,2 pins.

In loopback mode, the data is projected

on SOUT1,2 pins.

No ID pin.

IRSL0-2 is multiplexed with ID0-2

PC97338 Datasheet(PDF) 216 Page - National Semiconductor (TI)

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