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AT89LP428 数据表(PDF) 84 Page - ATMEL Corporation

部件名 AT89LP428
功能描述  8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
PDF  149 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89LP428 数据表(HTML) 84 Page - ATMEL Corporation

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84
3654A–MICRO–8/09
AT89LP428/828
Figure 16-2. Mode 0 Waveforms
Mode 0 may be used as a hardware accelerator for software emulation of serial interfaces such
as a half-duplex Serial Peripheral Interface (SPI) in mode (0,0) or (1,1) or a Two-wire Interface
(TWI) in master mode. An example of Mode 0 emulating a TWI master device is shown in Figure
16-3. In this example, the start, stop, and acknowledge are handled in software while the byte
transmission is done in hardware. Falling/rising edges on TXD are created by setting/clearing
SM2. Rising/falling edges on RXD are forced by setting/clearing the P3.0 register bit. SM2 and
P3.0 must be 1 while the byte is being transferred.
Figure 16-3. UART Mode 0 TWI Emulation (SMOD1 = 1)
Mode 0 transfers data LSB first whereas SPI or TWI are generally MSB first. Emulation of these
interfaces may require bit reversal of the transferred data bytes. The following code example
reverses the bits in the accumulator:
EX:
MOV
R7, #8
REVRS: RLC
A
; C << msb(ACC)
XCH
A, R6
RRC
A
; msb(ACC) >> B
XCH
A, R6
DJNZ R7, REVRS
7
RXD (TX)
TXD
6
5
4
3
2
1
0
RXD (RX)
01234567
7
RXD (TX)
TXD
6
5
4
3
2
1
0
RXD (RX)
01234567
7
RXD (TX)
TXD
6
5
4
3
2
1
0
RXD (RX)
01234567
7
RXD (TX)
TXD
6
5
4
3
2
1
0
RXD (RX)
01234567
SMOD1 = 0
SM2 = 0
SMOD1 = 1
SM2 = 0
SMOD1 = 0
SM2 = 1
SMOD1 = 1
SM2 = 1
7
(SDA) RXD
(SCL) TXD
6
5
4
3
2
1
0
ACK
SM2
P3.0
Write to SBUF
TI
Sample ACK



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