CDP1854 Intersil Corporation, CDP1854 Datasheet - Page 3

• Manufacturer Part Number: CDP1854
• Description: Programmable Universal Asynchronous Receiver/Transmitter (UART)
• Manufacturer: Intersil Corporation

Block Diagram
Mode Input High (Mode = 1)
NOTE: 1. User Interconnect
SDO
25
TRANSMITTER BUS
TRANSMITTER
TRANSMITTER
(SEE NOTE 1)
REGISTER
REGISTER
HOLDING
(26 - 33)
PARITY
SHIFT
GEN
FIGURE 1. MODE 1 BLOCK DIAGRAM (CDP1800-SERIES MICROPROCESSOR COMPATIBLE)
CONTROL
REG
TRANSMITTER SECTION
40
TRANSMITTER
CONTROL
TIMING &
24
23
39
CDP1854A, CDP1854AC
SELECT
LOGIC
4
35
34
5-44
INTERFACE
CDP1802
(SEE NOTE 1)
18
13
INT
16
RECEIVER SECTION
22
38
REGISTER
14
RECEIVER
STATUS
CONTROL
TIMING &
37
15
17
19
RECEIVER BUS
THREE-STATE
(SEE NOTE 1)
REGISTER
RECEIVER
REGISTER
HOLDING
DRIVERS
SHIFT
1, 2 = V
(5-12)
MUX
21 = CLEAR
36 = NC
3 = V
DD
SS
20
SDI