Z8S180 Zilog., Z8S180 Datasheet - Page 156
Z8S180
Manufacturer Part Number
Z8S180
Description
ENHANCED Z180 MICROPROCESSOR
Manufacturer
Zilog.
Datasheet
1.Z8S180.pdf
(326 pages)
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Z 8018x Fam il y
M PU Us e r M anual
141
ASCI to/from DMAC Operation
Operation of the ASCI with the on-chip DMAC channel 0 requires that the
DMAC be correctly configured to use the ASCI flags as DMA request signals.
ASCI and RESET
During RESET, the ASCI status and control registers are initialized as
defined in the individual register descriptions.
Receive and Transmit operations are stopped during RESET. However,
the contents of the transmit and receive data registers (TDR and RDR) are
not changed by RESET.
ASCI Clock
When in external clock input mode, the external clock is directly input to
the sampling rate ( 16/ 64) as depicted in Figure 56.
Baud Rate Selection Prescaler
Sampling Rate
Internal Clock
Phi
1 to 64
16 64
10
30
External Clock
fc
Phi
40
Figure 56.
ASCI Clock
UM005001-ZMP0400
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