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| 型號(hào)： | 71M6531D-IMR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC68 |
| 封裝： | LEAD FREE, QFN-68 |
| 文件頁(yè)數(shù)： | 41/120頁(yè) |
| 文件大?。?/td> | 2477K |
| 代理商： | 71M6531D-IMR/F |
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FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
v1.3
2005-2010 TERIDIAN Semiconductor Corporation
27
The feature of receiving 9 bits (Mode 3 for UART0, Mode A for UART1) can be used as handshake signals
for inter-processor communication in multi-processor systems. In this case, the slave processors have bit
SM20 (S0CON[5]) for UART0, or SM21 (S1CON[5] for UART1, set to 1. When the master processor outputs
the slave’s address, it sets the 9
th bit to 1, causing a serial port receive interrupt in all the slaves. The slave
processors compare the received byte with their address. If there is a match, the addressed slave will
clear SM20 or SM21 and receive the rest of the message. All other slaves will ignore the message. After
addressing the slave, the host outputs the rest of the message with the 9
th bit set to 0, so no additional
serial port receive interrupts will be generated.
UART Control Registers:
The functions of UART0 and UART1 depend on the setting of the Serial Port Control Registers S0CON
Since the TI0, RI0, TI1 and RI1 bits are in an SFR bit addressable byte, common practice
would be to clear them with a bit operation, but this must be avoided
The proper way to clear these flag bits is to write a byte mask consisting of all ones except for
a zero in the location of the bit to be cleared. The flag bits are configured in hardware to ignore
ones written to them.
. The hardware implements
bit operations as a byte wide read-modify-write hardware macro. If an interrupt occurs after
the read, but before the write, its flag will be cleared unintentionally.
Table 17: The S0CON (UART0) Register (SFR 0x98)
Bit
Symbol
Function
S0CON[7]
SM0
The SM0 and SM1 bits set the UART0 mode:
Mode
Description
SM0
SM1
0
N/A
0
1
8-bit UART
0
1
2
9-bit UART
1
0
3
9-bit UART
1
S0CON[6]
SM1
S0CON[5]
SM20
Enables the inter-processor communication feature.
S0CON[4]
REN0
If set, enables serial reception. Cleared by software to disable reception.
S0CON[3]
TB80
The 9th transmitted data bit in Modes 2 and 3. Set or cleared by the
MPU, depending on the function it performs (parity check, multiprocessor
communication etc.)
S0CON[2]
RB80
In Modes 2 and 3 it is the 9
th data bit received. In Mode 1, SM20 is 0,
RB80 is the stop bit. In mode 0, this bit is not used. Must be cleared by
software.
S0CON[1]
TI0
Transmit interrupt flag; set by hardware after completion of a serial transfer.
Must be cleared by software.
S0CON[0]
RI0
Receive interrupt flag; set by hardware after completion of a serial reception.
Must be cleared by software.
Table 18: The S1CON (UART1) register (SFR 0x9B)
Bit
Symbol
Function
S1CON[7]
SM
Sets the baud rate and mode for UART1.
SM
Mode
Description
Baud Rate
0
A
9-bit UART
variable
1
B
8-bit UART
variable
S1CON[5]
SM21
Enables the inter-processor communication feature.
S1CON[4]
REN1
If set, enables serial reception. Cleared by software to disable reception.
S1CON[3]
TB81
The 9
th transmitted data bit in Mode A. Set or cleared by the MPU,
depending on the function it performs (parity check, multiprocessor
communication etc.)
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