EB632 datasheet(39/112 Pages) FREESCALE

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CPM

Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2

Freescale Semiconductor

ERAM

16–19

Enable RAM Microcode

Configure as instructed in the download process of a

Freescale-supplied RAM microcode package.

Note: this area was expanded from the 3-bit field used

by the 2K42A mask set.

EDM[1–4]

20–23

Edge Detect Mode

EXT

x asserts requests according to settings

Note:

Reserved for future microcode applications.

Low to high change for EXT x = 0, active high

for

EXT x = 1

High to low change for EXT x = 0, active low for

EXT x = 1

EXT[3–4]M

24–25

External Request Mode

Controls the external request sensitivity

Note:

Reserved for future microcode applications.

EXT

x is edge-sensitive according to EDMx

EXT

x is level-sensitive according to EDMx

EXT3P

26–27

External Request Priority

Controls the external request priority relative to

communication controllers

Note:

Reserved for future microcode applications.

EXT

x has higher priority than the

communication

‘controllers (default)

EXT

x has lower priority than the

communications

controllers

EXT

x has the lowest priority

Reserved

—

28–29

Reserved for future applications

Table 32. 2K87M Mask Set RCCR Bit Descriptions (Continued)

Name

Reset

Description

Settings

ERAM

RAM Microcode

0000

Disable microcode program

execution from the dual-port RAM.

For the following, execution starts at 0x0000

after reset:

0010

Microcode uses the first 2 KB + 8 KB

from 0x4000

0100

Microcode uses the first 4 KB + 8 KB

from 0x4000

0110

Microcode uses the first 6 KB + 8 KB

from 0x4000

1000

Microcode uses the first 8 KB + 8 KB

from 0x4000

1010

Microcode uses the first 10 KB + 8

KB from 0x4000

1100

Microcode uses the first 12 KB + 8

KB from 0x4000

For the following, execution starts at 0x4000

after reset:

0011

Microcode uses the first 2 KB

starting from 0x4000

0101

Microcode uses the first 4 KB

starting from 0x4000

0111

Microcode uses the first 6 KB

starting from 0x4000

1001

Microcode uses the first 8 KB

starting from 0x4000

All other combinations are reserved.

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