AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 119

• Manufacturer Part Number: AT89LP6440-20PU
• Description: MCU 8051 64K FLASH ISP 40PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20PU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 18-12. Format and States in Master Receiver Mode
18.6.3
3706A–MICRO–9/09
Successfull
reception
from a slave
receiver
Next transfer
started with a
repeated start
condition
Not acknowledge
received after the
slave address
Arbitration lost in slave
address or data byte
Arbitration lost and
addressed as slave
Slave Receiver Mode
From master to slave
From slave to master
08h
S
SLA
In the Slave Receiver mode, a number of data bytes are received from a master transmitter. To
initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:
The upper seven bits are the address to which the Two-wire Serial Interface will respond when
addressed by a master. If the LSB is set, the TWI will respond to the general call address (00h),
otherwise it will ignore the general call address.:
TWAR
Value
TWCR
Value
R
MR
TWA6
A or A
DATA
X
–
40h
48h
38h
68h
A
A
A
78h
TWEN
Other master
Other master
TWA5
n
continues
continues
1
P
B0h
DATA
A
TWA4
Device’s own Slave Address
STA
0
Any number of data bytes
and their associated acknowledge bits
This number (contained in TWSR) corresponds
to a defined state of the Two-wire Serial Bus. The
prescaler bits are zero or masked to zero
TWA3
STO
50h
38h
To corresponding
states in slave mode
0
A
A
AT89LP6440 - Preliminary
Other master
DATA
continues
TWA2
TWIF
0
58h
A
TWA1
AA
1
10h
P
R
S
TWA0
–
X
SLA
GC
X
X
–
W
R
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MT