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PXAG49KBBD Datasheet(PDF) 29 Page - NXP Semiconductors

Part No. PXAG49KBBD
Description  XA 16-bit microcontroller family
Download  42 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PXAG49KBBD Datasheet(HTML) 29 Page - NXP Semiconductors

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Philips Semiconductors
Preliminary data
XA-G49
XA 16-bit microcontroller family
64K Flash/2K RAM, watchdog, 2 UARTs
2001 Jun 27
29
BIT
SYMBOL
FUNCTION
SnCON.5
SM2
Enables the multiprocessor communication feature in Modes 2 and 3. In Mode 2 or 3, if SM2 is set to 1, then RI
will not be activated if the received 9th data bit (RB8) is 0. In Mode 1, if SM2=1 then RI will not be activated if a
valid stop bit was not received. In Mode 0, SM2 should be 0.
SnCON.4
REN
Enables serial reception. Set by software to enable reception. Clear by software to disable reception.
SnCON.3
TB8
The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired. The TB8 bit is not
double buffered. See text for details.
SnCON.2
RB8
In Modes 2 and 3, is the 9th data bit that was received. In Mode 1, if SM2=0, RB8 is the stop bit that was
received. In Mode 0, RB8 is not used.
SnCON.1
TI
Transmit interrupt flag. Set when another byte may be written to the UART transmitter. See text for details.
Must be cleared by software.
SnCON.0
RI
Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the end of the stop bit time
in the other modes (except see SM2). Must be cleared by software.
Where SM0, SM1 specify the serial port mode, as follows:
SM0
SM1
Mode
Description
Baud Rate
0
0
0
shift register
fOSC/16
0
1
1
8-bit UART
variable
1
0
2
9-bit UART
fOSC/32
1
1
3
9-bit UART
variable
SU00597C
RI
TI
RB8
TB8
REN
SM2
SM1
SM0
SnCON
Address:
S0CON 420
S1CON 424
Bit Addressable
Reset Value: 00H
LSB
MSB
Figure 16. Serial Port Control (SnCON) Register
D0
D1
D2
D3
D4
D5
D6
D7
D8
STOP
BIT
DATA BYTE
ONLY IN
MODE 2, 3
START
BIT
SU00598
FEn
BRn
OEn
STINTn
SnSTAT
if 0, sets FE
Figure 17. UART Framing Error Detection
SM0_n
SM1_n
SM2_n
REN_n
TB8_n
RB8_n
TI_n
RI_n
SnCON
D0
D1
D2
D3
D4
D5
D6
D7
D8
1
1
1
0
COMPARATOR
11
X
RECEIVED ADDRESS D0 TO D7
PROGRAMMED ADDRESS
IN UART MODE 2 OR MODE 3 AND SM2 = 1:
INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS”
– WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES
– WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.
SU00613
Figure 18. UART Multiprocessor Communication, Automatic Address Recognition


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