MPC8280 datasheet(210/1386 Pages) FREESCALE

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System Interface Unit (SIU)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

4-38

Freescale Semiconductor

Table 4-14 describes SYPCR fields.

4.3.2.9

Software Service Register (SWSR)

The software service register (SWSR) is the location to which the software watchdog timer servicing

sequence is written. To prevent software watchdog timer time-out, the user should write 0x556C followed

by 0xAA39 to this register, which resides at 0x1000E. SWSR can be written at any time, but returns all

zeros when read.

Table 4-14. SYPCR Field Descriptions

Bits

Name

Description

0–15

SWTC

Software watchdog timer count. Contains the count value for the software watchdog timer.

16–23

BMT

Bus monitor timing. Defines the time-out period for the bus monitor, the granularity of this field is 8

bus clocks. (BMT = 0xFF is translated to 0x7f8 clock cycles). BMT is used both in the 60x and local

bus monitors.

Note that the value 0 in invalid; an error is generated for each bus transaction.

PBME

60x bus monitor enable.

0 60x bus monitor is disabled.

1 The 60x bus monitor is enabled.

LBME

Local bus monitor enable.

0 Local bus monitor is disabled.

1 The local bus monitor is enabled.

26–28

—

Reserved, should be cleared.

SWE

Software watchdog enable. Enables the operation of the software watchdog timer. It should be

cleared by software after a system reset to disable the software watchdog timer.

SWRI

Software watchdog reset/interrupt select.

0 Software watchdog timer and bus monitor time-out cause a machine check interrupt to the core.

1 Software watchdog timer and bus monitor time-out cause a hard reset (this is the default value

after soft reset).

SWP

Software watchdog prescale. Controls the divide-by-2,048 software watchdog timer prescaler.

0 The software watchdog timer is not prescaled.

1 The software watchdog timer clock is prescaled.

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