Specifications

Serial Communications (82050)
PROGRAMMABLE REGISTERS
The remainder of the functional blocks illustrated in Figure 11-1 are
programmable registers. Table 11-1 shows the address of each of the
registers.
Table 11-5 on pages 11-25 and 11-26 summarizes the ACC register
set for programming reference.
Table 11-1
ACC Register Addressing.
Address Register Operation Page #
03F8h (DL = 0) Receive Buffer Read 11-8
Transmit Buffer Write 11-8
(DL = 1) Divisor Latch LSB Read/Write 11-17
03F9h (DL = 0) Interrupt Enable Read/Write 11-19
(DL = 1) Divisor Latch MSB Read/Write 11-17
03FAh (DL = X) Interrupt Identify Read 11-18
03FBh (DL = X) Line Control Read/Write 11-8
03FCh (DL = X) Modem Control Read/Write 11-13
03FDh (DL = X) Line Status Read 11-11
03FEh (DL = X) Modem Status Read/Write 11-15
03FFh (DL = X) Reserved -- --
11-7