Z8S180 Zilog., Z8S180 Datasheet - Page 148
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Z8S180
Manufacturer Part Number
Z8S180
Description
ENHANCED Z180 MICROPROCESSOR
Manufacturer
Zilog.
Datasheet
1.Z8S180.pdf
(326 pages)
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Bit
Position Bit/Field R/W
5
4
3
2
–
0
CTS/PS
PEO
DR
SS2
–
0
The external ASCI channel 0 data clock pins are multiplexed with DMA
control lines (CKA0/DREQ and CKA1/TEND0). During RESET, these
R/W
R/W
R/W
R/W
Value
Description
Clear to Send/Prescale — When read,
the state of the external
is High,
High, the TDRE bit is inhibited (that is, held at 0). For
channel 1, the
(Clocked Serial Receive Data). Thus,
valid when read if the channel 1 CTS1E bit is 1 and the
CST1 input pin function is selected. The read data of
CTS
When written, CT /PS specifies the baud rate generator
prescale factor. If
prescaled by 30 while if
system clock is prescaled by 10.CTS/PS is cleared to 0
during RESET.
Parity Even Odd — PE0 selects even or odd parity. PE0
does not affect the enabling/disabling of parity (MOD1
bit of CNTLA). If PE0 is cleared to 0, even parity is
selected. If PE0 is set to 1, odd parity is selected.PE0 is
cleared to 0 during RESET.
Divide Ratio — DR specifies the divider used to obtain
baud rate from the data sampling clock If DR is reset to 0,
divide by 16 is used, while if DR is set to 1, divide by 64
is used. DR is cleared to 0 during RESET.
Source/Speed Select — Specifies the data clock source
(internal or external) and baud rate prescale factor. SS2,
SS1, and SS0 are all set to 1 during RESET. Table 18
describes the divide ratio corresponding to SS2, SS1 and
SS0
/PS is not affected by RESET.
CTS
/PS is read as 1. When the
CTS
CTS
1 input is multiplexed with RXS pin
/PS is set to 1, the system clock is
CTS
CTS
input. If the
/PS is cleared to 0, the
M PU Us e r M anual
UM005001-ZMP0400
Z 8018x Fam il y
CTS
CTS
CTS
CTS
/PS is only
/PS reflects
input pin is
input pin
133
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