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• Divisor = TIMER_TMR[n]_PER>> 3, if UART_CLK.EDBO=1
The Autobaud Detection Character 0x40 figure shows the ASCII "@" (0x40) detection character.
Figure 17-4: Autobaud Detection Character 0x40
UART Debug Features
The UART can automatically calculate and transmit a parity bit. The UART Parity table summarizes parity behav-
ior assuming 8-bit data words (UART_CTL.WLS=b#11).
Table 17-8: UART Parity
PEN
STP
0
x
1
0
1
0
1
0
1
0
1
1
1
1
The two force error bits, UART_CTL.FPE and UART_CTL.FFE, are intended for test purposes. They are useful
for debugging software, especially in loopback mode.
The UART can be set to internal loopback mode (UART_CTL.LOOP_EN=1). Loopback mode disconnects the in-
put of the receiver from the receive pin and internally redirects the transmit output to the receiver. The transmit pin
remains active and continues to transmit data externally as well. Loopback mode also forces the UART_RTS pin to
deassert, disconnects the UART_STAT.CTS bit from the UART_CTS input pin, and connects the internal version
of UART_RTS to the UART_STAT.CTS bit.
Additionally, the UART_TX pin can be forced to zero asynchronously using the UART_CTL.SB bit.
UART Operating Modes
The following sections describe the main operating modes of the UART.
•
UART Mode
•
IrDA SIR Mode
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
S
0
1
2
3
PERIOD
EPS
Data (hex)
x
x
0
0x60
0
0x57
1
0x60
1
0x57
0
x
1
x
4
5
6
7
STOP
Data (binary, LSB
first)
x
0000 0110
1110 1010
0000 0110
1110 1010
x
x
UART Architectural Concepts
Parity
None
1
0
0
1
1
0
17–9
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