MPC8280 datasheet(561/1386 Pages) FREESCALE

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Communications Processor Module Overview

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

14-11

Table 14-4 describes RTSCR fields.

14.3.9

RISC Time-Stamp Register (RTSR)

The RISC time-stamp register (RTSR), shown in Figure 14-5, contains the time stamp.

After reset, setting RTSCR[RTE] causes the time stamp to start counting microseconds from zero.

14.3.10 RISC Microcode Revision Number

Associated with each version of CPM microcode, is a number (REV_NUM) that uniquely identifies that

specific microcode. This number is hard-coded into the microcode which is stored in the CPM's internal

ROM. At power-up, the Communication Processor (CP) reads this number, and proceeds to store it into

Field

—

RTE

RTPS (Timer Prescale)

Reset

0000_0000_0000_0000

R/W

Addr

0x119DC

Figure 14-4. RISC Time-Stamp Control Register (RTSCR)

Table 14-4. RTSCR Field Descriptions

Bits

Name

Description

0–4

—

Reserved

RTE

Time stamp enable.

0 Disable time-stamp timer.

1 Enable time-stamp timer.

6–15

RTPS

Time-stamp timer pre-scale. Must be programmed to generate a 1-µs period input clock to the

time-stamp timer. (Time-stamp frequency = (CPM frequency)/(RTPS+2)

Field

Time Stamp

Reset

—

R/W

Addr

0x119E0

Field

Time Stamp

Reset

—

R/W

Addr

0X119E2

Figure 14-5. RISC Time-Stamp Register (RTSR)

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