EB632 datasheet(38/112 Pages) FREESCALE

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

Freescale Semiconductor

CPM

RCCR configures the CP to run microcode from ROM or RAM and controls the CP internal timer.

Table 32. 2K87M Mask Set RCCR Bit Descriptions

Name

Reset

Description

Settings

TIME

Timer Enable

Enables the CP internal timer that generates a tick to

the CP based on the value programmed into the

TIMEP field. TIME can be modified at any time to start

or stop the scanning of the RISC timer tables.

Timer disabled

Timer enabled

—

Reserved. Write to zero for future compatibility.

TIMEP

2–7

Timer Period

Controls the CP timer tick. The RISC timer tables are

scanned on each timer tick, and the input to the timer

tick generator is the general system clock (150 MHz)

divided by 1,024. The formula is (TIMEP + 1)

× 1,024

= (general system clock period). Thus, a value of 0

stored in these bits gives a timer tick of 1

× (1,024) =

1,024 general system clocks and a value of 63

(decimal) gives a timer tick of 64

× (1,024) = 65,536

general system clocks.

EXT

[1–2]M

8–9

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

EXT1P

10–11

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

—

Reserved. Write to zero for future compatibility.

SCD

Scheduler Configuration

Configure as instructed in the download process of a

Freescale-supplied RAM microcode package.

Normal operation

Alternate configuration of the scheduler

EXT2P

14–15

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

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