SAB82538 Datasheet, PDF (174/253 Pages) Infineon Technologies AG – ICs for Communications

Baud Rate Generator Register (WRITE)
7
BGR
BR7
SAB 82538
SAF 82538
ASYNC Mode
0
BR0 (offset: 34)
BR7– BR0… Baud Rate, bits 7-0
Together with bits BR9, BR8 of CCR2, determines the division factor of the
baud rate generator.
In terms of the value N programmed in BR9 - BR0 (N = 0…1023), the
division factor k is:
k = (N + 1) × 2
Transmit Immediate Character (WRITE)
(Version 2 upwards)
7
TIC
TIC7
0
TIC0 (offset: 35)
When a character is written into this register its contents are inserted in the outgoing
character stream
– immediately upon writing this register by the microprocessor if the transmitter is in
IDLE state. If no further characters (XFIFO contents) are to be transmitted, i.e. the
transmitter returns to IDLE state after transmission of TIC, an ALLS (All Sent) interrupt
will be generated.
– after the end of a character currently being transmitted. This does not affect the
contents of the XFIFO. Transmission of characters from XFIFO is resumed after the
contents of register TIC are shifted out.
Transmission via this register is possible even when the transmitter is in XOFF state
(however, CTS must be “low”).
The TIC register is an eight-bit register. The number of significant bits is determined by
the programmed character length (right justified). Parity value (if programmed) and
selected number of stop bits are automatically appended, similar to the characters
written in the XFIFO. The usage of TIC is independent of the flow control, i.e. is not
affected by bit MODE.FLON.
To control access to register TIC, an additional status bit STAR.TEC (TIC Executing) is
implemented which indicates that transmission instruction of currently programmed TIC
is accepted but not completely executed. Further access to register TIC is only allowed
if bit STAR.TEC is reset by the ESCC8.
Semiconductor Group
174