Zilog Z16C35 Instrukcja Użytkownika Pobierz pdf (Strona 16)

100

101

ISCC

User Manual

UM011002-0808

A1/A//B. DMA Channel/Channel A/Channel B (bidirectional). This signal, when used as

input, selects the SCC channel in which the read and write operation occurs. Note that A0/

SCC//DMA pin must be held high to select this feature. When this pin is used as an output,

it is used in conjunction with the A0/SCC//DMA pin output to identify which DMA chan

nel is active. During a DMA peripheral access, the A1/A//B pin is ignored.

/RESET. (input, active Low). This signal resets the

device to a known state. The first

write to the ISC

C after a reset accesses the BCR to select additional bus options for the

device.

A1/A//B A0/SCC//DMA DMA channel

1 1 RxA

1 0 TxA

0 1 RxB

0 0 TxB

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