Commodore Plus 4 - Page 394

383 Using Peripheral Devices
4 receiver clock source
0 = external receiver clock
1 = baud rate generator
5-6 word length
00 = 8 bits
01 = 7 bits
10 = 6 bits
11 = 5 bits
7 stop bits
0 = 1 stop bit
1 = 2 stop bits
♦The 1660 cannot operate above 300 baud.
The command register values are as follows:
Bit(s) Meaning
0 data terminal ready
0 = disable receiver and all interrupts (DTR high)
1 = enable receiver and all interrupts (DTR low)
1 receiver interrupt enable
0 = IRQ interrupt enabled from bit 3 of status register
1 = IRQ interrupt disabled
2-3 transmitter controls:
00
oi-
io
11
Interrupt
= disabled
= enabled
= disabled
= disabled
mode for receiver
0 =
1 =
normal
echo (bits 2 and
RTS
Level
high
low
low
low
3 must be
Transmitter
Status
off
on
on
transmit BRK
00)
5-7 parity
—0 = disabled
001 = odd parity receive and transmit