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MC68302AG20C 产品修订记录 - NXP（恩智浦）
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NXP（恩智浦）
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微处理器
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LQFP-144
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MC68302AG20C数据手册
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MOTOROLA
MC68PM302 Device Errata
-1
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
MOTOROLA, INC., 1997
REVISION C CHANGES
February 27, 1997
68PM302 INTEGRATED MULTIPROTOCOL PROCESSOR
DEVICES
This document covers the 68PM302 Revision C.1, Mask 1F85S.Some minor new features
have been added to the 68PM302 Revision C device. These new features are not required
to be used, and the revision C device is fully compatible with the revision B device. The
main purpose of the revision C device is to allow the use of a 32Khz crystal with the on-chip
PLL. Revision C is visually labeled with mask number 1F85S.
NOTE:
The following information is not described in the MC68PM302 Reference Manual.
However, the use of that manual, plus this document, will fully describe revision C device
operation.
1. Use of 32Khz crystal with on-chip PLL
On previous versions of the PM302 (Rev A and B), users were unable to use a 32KHz crystal
with the on-chip PLL due to excessive jitter. This has been fixed on Rev C by rerouting the
pins,
ONLY
when using 32KHz mode. When using any other mode, the PM302 pinout does
not change, and remains as it was on Rev B. When using the 32KHz mode on Rev C, follow
these instructions:
1. Signal PC_A4 from the PCMCIA connector is connected to pin NC1.
2. Signal PC_A5 from the PCMCIA connector is connected to pin NC2.
3. Pin PC_A4 (next to EXTAL) on the chip should be grounded.
4. Pin PC_A5 (next to EXTAL) on the chip should be grounded.
5. The serial resistor between XTAL and the Crystal changes to 1K Ohms. Capacitors
between the Crystal and GND are 10 pf.
Notes:
Changes 3,4 (grounding the pins) are not mandatory, but helped a lot in our envior-
onment. Changes 5,6 (different caps and resistors) helped in our envioronment, but they
depend on the layout of the board and the crystal used. Once again, these changes only
occur when using the 32KHz crystal mode of the PLL.
2. Errata Fixes
Most rev B errata are fixed in rev C. See the MC68PM302 revision C device errata sheet
for details. An errata sheet also exists for the MC68PM302 Reference Manual.
Thi d d i h F M k 4 0 2
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