Specifications

Serial Communications (16C452)
D7-D0
DATA
BUS
BUFFER
RECEIVER
BUFFER
REGISTER
INTERNAL
DATA BUS
RECEIVER
SHIFT
REGISTER
SIN
RECEIVER
TIMING &
CONTROL
LINE
CONTROL
REGISTER
DIVISOR
LATCH (LS)
DIVISOR
LATCH (MS)
BAUD
GENERATOR
LINE
STATUS
REGISTER
TRANSMITTER
TIMING &
CONTROL
TRANSMITTER
HOLDING
REGISTER
TRANSMITTER
SHIFT
REGISTER
MODEM
CONTROL
REGISTER
MODEM
CONTROL
LOGIC
MODEM
STATUS
REGISTER
INTERRUPT
ENABLE
REGISTER
INTERRUPT
CONTROL
LOGIC
INTERRUPT
ID
REGISTER
+5V
GND
POWER
SUPPLY
INTRPT
R1
RSLD
DSR
DTR
CTS
RTS
SOUT
A0
A1
A2
CS0
CS1
CS2
AIOR
IOWC
CLK
SELECT
&
CONTROL
LOGIC
Figure 8–3. 16C452 Serial Port Block Diagram.
8-9