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4.5
I/O PORT
North Star HSIO-4
Each I/O port contains a USART, Configuration
and Clock Headers, a Baud Rate Select
Register, and an Interrupt Select Register.
(See Figure 4-2.)
TRANSMIT
BUFFER
7V
a
DATA BUFFERS
FUNCTIONAL BLOCK DIAGRAM OF AN INDIVIDUAL I/O PORT
60
PORT CONNECTOR
CONFIGURATION AND CLOCK HEADERS
USART
CONTROL REGISTERS
RECEIVE
STATUS REGISTERS
BUFFER
AND TIMING
INTERRUPT
RES
SELECT
7Y
E
I /O PORT
Ü
I / O
INTERRUPT
HEADER
AODRESS
DECODER
Figure 4-2
User/Technical Manual
BAUD
REG
RATE
SELECT
ff
BAUD RATE
GENERATOR
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