DSP56857 datasheet(64/662 Pages) FREESCALE

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Peripheral Descriptions

5685X Digital Signal Controller User Manual, Rev. 4

1-32

Freescale Semiconductor

1.12.7 Host Interface 8 (HI8)

Host Interface 8 (HI8) is an 8-bit, bidirectional data bus used to transfer data between the host

processor and the DSC. To accomplish this, a series of registers are provided to establish the

control desired, to monitor the status of the data transfer and to perform the data transfer itself.

Registers are divided into two groups:

1. Host side

2. DSC side

Both groups allow the host port to operate asynchronously to core clock. Generally, the mode of

operation is set using the host side control. The DSC side control provides the selectivity for

masking or unmasking the various DSC interrupt sources. There are various functional modes

possible in the transfer of data: 8-bit vs. 16-bit data transfers, DMA vs. single strobe or dual

strobe transactions, and interrupt versus polling status interrogation.

1.12.8 COP/Watchdog Timer Module

The Computer Operating Properly (COP) module monitors processor activity and provides an

automatic reset signal if a failure occurs. Please reference Chapter 16, Reset, Low Voltage,

Stop and Wait Operations.

•

16-bit counter to provide 65536 different time-out periods

•

Programmable wait and stop mode operation

•

Programmable time-out period from 32

µs to 2.1 sec. with a resolution of 32µs

1.12.9 Time of Day

•

Sequence counters to track seconds, minutes, hours, and days

•

Programmable prescaler to generate 1Hz clock

•

Generates interrupts capable of pulling the part out of Wait or Stop modes

•

Capability to track time up to 179.5 years

•

Configurable alarm and one second interrupts

1.12.10 System Integration Module

The System Integration Module (SIM) is responsible for several system control functions

including:

•

Clock generation

•

Reset generation

•

Power mode control

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