HP Vectra

The following chart gives examples of loading the divisor latch
registers
to determine the baud-rate.
Baud
MSB
(XF9H)
Bits
(XF8H)
Bits LSB
Rate Divisor 7 6 543 2
1 a 7 6 543 2 1 a
75
1536 a a a a a 1 1 a a a a a a a a a
110 1047 a a a a a 1 a a
000 10 111
300 384 a a a a a a a 1 1 a a a a a a a
600 192 a a a a a a a a
11000000
1200 96
a a a a a a a a
a
1 100 a a a
2400
48
a a a a a a a a
a a
1 1 a a a a
4800 24 a a a a a a a a
a a a
1 100 a
9600
12
a a a a a a a a
a a a a
1 100
19200 6
a a a a a a a a
a a a a
0 1 1 a
Interrupt Enable Register (XF9H)
This register enables and disables the four interrupt signals of the
~
HP24540A.
Bit Data
Interrupt
a
1
Enable the received data available interrupt.
a
Disable interrupt.
1
Enable transmitter holding register empty interrupt.
a Disable interrupt.
2
1 Enable the receiver line status interrupt
a Disable interrupt.
3 1
Enable the modem status interrupt.
a Disable interrupt.
~
4-7
a
Always.
126 Serial/Parallel Card