鈥?/div>
CCP1IE
BRGH
TMR2IE
TRMT
TMR1IE
TX9D
0000 -000
0000 -010
0000 0000
Value on all
other Resets
0000 -000
0000 -00x
0000 0000
0000 -000
0000 -010
0000 0000
USART Transmit Register
ADIE
TX9
RCIE
TXEN
Baud Rate Generator Register
Legend:
x
= unknown,
-
= unimplemented, read as '0'. Shaded cells are not used for synchronous master transmission.
Note 1:
Bits PSPIE and PSPIF are reserved on the PIC16F870; always maintain these bits clear.
FIGURE 9-9:
SYNCHRONOUS TRANSMISSION
Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4
Q1Q2 Q3Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2 Q3Q4
RC7/RX/DT pin
RC6/TX/CK pin
Write to
TXREG reg
Write word1
TXIF bit
(Interrupt flag)
TRMT
TRMT bit
鈥?鈥?/div>
bit 0
bit 1
WORD 1
bit 2
bit 7
bit 0
bit 1
WORD 2
bit 7
Write word2
TXEN bit
鈥?鈥?/div>
Note:
Sync master mode; SPBRG = '0'. Continuous transmission of two 8-bit words
FIGURE 9-10: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RC7/RX/DT pin
RC6/TX/CK pin
bit0
bit1
bit2
bit6
bit7
Write to
TXREG reg
TXIF bit
TRMT bit
TXEN bit
DS30569A-page 74
Preliminary
漏
1999 Microchip Technology Inc.
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