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94 / 400 page  &3, ,QWHUUXSW DQG 7UDS )XQFWLRQV User’s Manual 5-12 1999-08 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. The table below 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 00 H) 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 Previous COUNT Modified COUNT IR after PEC service Action of PEC Channel and Comments FF H FF H ‘0’ Move a Byte / Word Continuous transfer mode, i.e. COUNT is not modified FE H..02H FD H..01H ‘0’ Move a Byte / Word and decrement COUNT 01 H 00 H ‘1’ Move a Byte / Word Leave request flag set, which triggers another request 00 H 00 H (‘1’) No action! Activate interrupt service routine rather than PEC channel. |
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