AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 98

• 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

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AT89LP6440 - Preliminary
Figure 17-1. SPI Block Diagram
The interconnection between master and slave CPUs with SPI is shown in
pins in the interface are Master-In/Slave-Out (MISO), Master-Out/Slave-In (MOSI), Shift Clock
(SCK), and Slave Select (SS). The SCK pin is the clock output in master mode, but is the clock
input in slave mode. The MSTR bit in SPCR determines the directions of MISO and MOSI. Also
notice that MOSI connects to MOSI and MISO to MISO. By default SS/P1.4 is an input to both
master and slave devices.
In slave mode, SS must be driven low to select an individual device as a slave. When SS is held
low, the SPI is activated, and MISO becomes an output if configured so by the user. All other
pins are inputs. When SS is driven high, all pins are inputs, and the SPI is passive, which means
that it will not receive incoming data. Note that the SPI logic will be reset once the SS pin is
driven high. The SS pin is useful for packet/byte synchronization to keep the slave bit counter
synchronous with the master clock generator. When the SS pin is driven high, the SPI slave will
immediately reset the send and receive logic, and drop any partially received data in the Shift
Register.The slave may ignore SS by setting its SSIG bit in SPSR. When SSIG = 1, the slave is
always enabled and operates in 3-wire mode. However, the slave output on MISO may still be
disabled by setting DISSO = 1.
T1 OVF
÷4/÷8/÷32/÷64
SPI Status Register
Oscillator
Select
Divider
1
0
SPI Control
TSCK
SPI Clock (Master)
SPI Interrupt
Request
MSTR
SPE
8
MSB
Data Bus
Internal
8
Read Data Buffer
Write Data Buffer
8-bit Shift Register
8
SPI Control Register
Clock
Logic
LSB
Figure
S
M
M
S
S
M
3706A–MICRO–9/09
17-2. The four
MISO
MOSI
P1.6
P1.5
SCK
P1.4
1.7
SS