Aaeon PCM-4330, Инструкция по эксплуатации

Страница: 87 / 127

87
Parallel Port
The parallel centronics port is programmable (see Lit. [4]). It may operate in uni-
directional mode (AT standard) or bi-directional mode. It contains the following
registers:
n
Bi-directional parallel port for data transfer
n
Status register for requests of the printer status
n
Readback control register
Serial Port
Both serial RS-232-C ports are programmable via the FDC37C92x chip. This highly
integrated chip features two independent channels for the AT-compatible 16550
port. Each channel controls its own send/receive channel, has its own data register
and interrupts. Modem control signals are provided for each channel.
Programmable features are:
n
Serial data transmission with 5, 6, 7 or 8-bit characters
n
Generation/detection of even, odd or no parity
n
Generation of 1,1.5 or 2 Stop-Bits
n
Baud rate generator to divide the 1.8432 MHz clock frequency
5.12
5.13