AT89LP3240 Atmel Corporation, AT89LP3240 Datasheet - Page 91

• Manufacturer Part Number: AT89LP3240
• Manufacturer: Atmel Corporation

Specifications of AT89LP3240

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 38
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 153.8
• Sram (kbytes): 4.25
• Eeprom (bytes): 8192
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 3.6
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

Figure 16-2. Mode 0 Waveforms
Figure 16-3. UART Mode 0 TWI Emulation (SMOD1 = 1)
3706C–MICRO–2/11
Write to SBUF
(SDA) RXD
(SCL) TXD
SMOD1 = 0
SM2 = 0
SMOD1 = 1
SM2 = 0
SMOD1 = 0
SM2 = 1
SMOD1 = 1
SM2 = 1
SM2
P3.0
TI
RXD (RX)
RXD (RX)
RXD (RX)
RXD (RX)
RXD (TX)
RXD (TX)
RXD (TX)
RXD (TX)
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
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.
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:
TXD
TXD
TXD
TXD
EX:
REVRS: RLC
0
MOV
XCH
RRC
XCH
DJNZ R7, REVRS
1
0
0
0
0
0
0
0
0
R7, #8
A
A, R6
A
A, R6
2
1
1
1
1
1
1
1
1
3
2
2
2
2
2
2
2
2
; C << msb(ACC)
; msb(ACC) >> B
4
3
3
3
3
3
3
3
3
5
4
4
4
4
4
4
4
4
6
5
5
5
5
5
5
Sample ACK
5
5
AT89LP3240/6440
7
6
6
6
6
6
6
6
6
ACK
7
7
7
7
7
7
7
7
Figure
91