AT89LS53-12PI Atmel, AT89LS53-12PI Datasheet - Page 15
![IC 8051 MCU FLASH 12K 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
AT89LS53-12PI
Manufacturer Part Number
AT89LS53-12PI
Description
IC 8051 MCU FLASH 12K 40DIP
Manufacturer
Atmel
Series
89LSr
Datasheet
1.AT89LS53-12AC.pdf
(35 pages)
Specifications of AT89LS53-12PI
Core Processor
8051
Core Size
8-Bit
Speed
12MHz
Connectivity
SPI, UART/USART
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
12KB (12K x 8)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
AT89LS5312PI
The interconnection between master and slave CPUs with
SPI is shown in the following figure. The SCK pin is the
clock output in the master mode but is the clock input in the
slave mode. Writing to the SPI data register of the master
CPU starts the SPI clock generator, and the data written
shifts out of the MOSI pin and into the MOSI pin of the
slave CPU. After shifting one byte, the SPI clock generator
stops, setting the end of transmission flag (SPIF). If both
the SPI interrupt enable bit (SPIE) and the serial port inter-
rupt enable bit (ES) are set, an interrupt is requested.
Figure 7. SPI Master-Slave Interconnection
Figure 8. SPI transfer Format with CPHA = 0
*Not defined but normally MSB of character just received
0851C–MICRO–3/06
CLOCK GENERATOR
SPI
MSB
8-BIT SHIFT REGISTER
MASTER
LSB
MISO
MOSI MOSI
SCK
SS
V
The Slave Select input, SS/P1.4, is set low to select an
individual SPI device as a slave. When SS/P1.4 is set high,
the SPI port is deactivated and the MOSI/P1.5 pin can be
used as an input.
There are four combinations of SCK phase and polarity
with respect to serial data, which are determined by control
bits CPHA and CPOL. The SPI data transfer formats are
shown in Figures 8 and 9.
CC
MISO
SCK
SS
MSB
8-BIT SHIFT REGISTER
SLAVE
AT89LS53
LSB
15