C167CS datasheet(96/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-13

V2.0, 2000-07

Byte/Word Transfer bit BWT controls, if a byte or a word is moved during a PEC

service cycle. This selection controls the transferred data size and the increment step for

the modified pointer.

Increment Control field INC controls, if one of the PEC pointers is incremented after

the PEC transfer. It is not possible to increment both pointers, however. If the pointers

are not modified (INC = ‘00’), the respective channel will always move data from the

same source to the same destination.

Note: The reserved combination ‘11’ is changed to ‘10’ by hardware. However, it is not

recommended to use this combination.

The PEC Transfer Count Field COUNT controls the action of a respective PEC channel,

where the content of bit field COUNT at the time the request is activated selects the

action. COUNT may allow a specified number of PEC transfers, unlimited transfers or

no PEC service at all.

Table 5-5 summarizes, how the COUNT field itself, the interrupt requests flag IR and the

PEC channel action depends on the previous content of COUNT.

The PEC transfer counter allows to service a specified number of requests by the

respective PEC channel, and then (when COUNT reaches 00H) activate the interrupt

service routine, which is associated with the priority level. After each PEC transfer the

COUNT field is decremented and the request flag is cleared to indicate that the request

has been serviced.

Table 5-5

Influence of Bitfield COUNT

COUNT

Modified

COUNT

IR after PEC

Service

Action of PEC Channel

and Comments

FFH

‘0’

Move a Byte/Word

Continuous transfer mode, i.e. COUNT is not

modified.

FEH … 02H FDH … 01H ‘0’

Move a Byte/Word and decrement COUNT

01H

00H

‘1’

Move a Byte/Word

Leave request flag set, which triggers

another request.

00H

(‘1’)

No action!

Activate interrupt service routine rather than

PEC channel.

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