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DIRECT MEMORY ACCESS UNIT
Timer 2
DMA Request
Serial Transmitter
DMA Request
Serial Receiver
DMA Request
10.1.11 DMA Module Integration
The DMA Unit of the 80C186EC/C188EC consists of two DMA modules (a total of four chan-
nels) and the Inter-Module Arbitration Circuitry (see Figure 10-8).
10-12
A
B
A
B
Select
(From Internal
DMA Request
Multiplexer Register)
Figure 10-7. Internal DMA Request Multiplexer
Q
S
Q
S
Internal
DMA Request
For Channel 0
Internal
DMA Request
For Channel 1
A1183-0A
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