AT89LP4052 Atmel Corporation, AT89LP4052 Datasheet - Page 37

• Manufacturer Part Number: AT89LP4052
• Manufacturer: Atmel Corporation

Specifications of AT89LP4052

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 15
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 2
• Isp: SPI
• Watchdog: Yes

Figure 18-2. Serial Port Mode 1
3547J–MICRO–10/09
SMOD1
= 0
OVERFLOW
TIMER 1
SHIFT
TXD
TI
DATA
CLOCK
÷2
TX
BIT DETECTOR SAMPLE TIMES
WRITE TO SBUF
SHIFT
RI
SMOD1
= 1
RXD
START BIT
CLOCK
RX
SEND
RXD
WRITE
SAMPLE
SBUF
D0
TO
TRANSITION
DETECTOR
INTERRUPT
1-TO-0
÷16 RESET
START BIT
÷16
D1
SERIAL
PORT
START
D2
START
RX CLOCK
DETECTOR
D0
÷16
D
CL
“1”
RX CLOCK
S
BIT
Q
D3
D1
ZERO DETECTOR
RX CONTROL
TX CONTROL
READ
SBUF
RI
TI TI
INTERNAL BUS
LOAD
SBUF
D4
SBUF
D2
SHIFT
INTERNAL BUS
INPUT SHIFT REG.
1FFH
SEND
SHIFT
DATA
LOAD
SBUF
SBUF
D5
(9 BITS)
D3
D6
D4
SHIFT
D7
D5
AT89LP2052/LP4052
D6
TXD
STOP BIT
D7
STOP BIT
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