AT89C5132-ROTUL Atmel, AT89C5132-ROTUL Datasheet - Page 114

• Manufacturer Part Number: AT89C5132-ROTUL
• Description: IC 8051 MCU FLASH 64K USB 80TQFP
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5132-ROTUL

• Core Processor: C52X2
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IDE/ATAPI, I²C, MMC, PCM, SPI, UART/USART, USB
• Peripherals: I²S, POR, WDT
• Number Of I /o: 44
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Cpu Family: 89C
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Interface Type: IDE/SPI/UART/USB
• Total Internal Ram Size: 2.25KB
• # I/os (max): 44
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3V
• Operating Supply Voltage (max): 3.3V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 2-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 80
• Package Type: TQFP
• Package: 80TQFP
• Family Name: 89C
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 3 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 44
• Number Of Timers: 2
• Maximum Clock Frequency: 20 MHz
• Data Ram Size: 2304 B
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 2
• Height: 1.45 mm
• Length: 14.1 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): 2.7 V
• Width: 14.1 mm
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18.5
18.6
18.6.1
114
Multiprocessor Communication
(Modes 2 and 3)
Automatic Address Recognition
AT89C5132
Given Address
Figure 18-14. Baud Rate Generator Selection (mode 2)
Figure 18-15. Baud Rate Formula (Mode 2)
Modes 2 and 3 provide a ninth-bit mode to facilitate multiprocessor communication. To enable
this feature, set SM2 bit in SCON register. When the multiprocessor communication feature is
enabled, the Serial Port can differentiate between data frames (ninth bit clear) and address
frames (ninth bit set). This allows the AT89C5132 to function as a slave processor in an environ-
ment where multiple slave processors share a single serial line.
When the multiprocessor communication feature is enabled, the receiver ignores frames with
the ninth bit clear. The receiver examines frames with the ninth bit set for an address match. If
the received address matches the slaves address, the receiver hardware sets RB8 and RI bits in
SCON register, generating an interrupt.
The addressed slave’s software then clears SM2 bit in SCON register and prepares to receive
the data Bytes. The other slaves are unaffected by these data Bytes because they are waiting to
respond to their own addresses.
The automatic address recognition feature is enabled when the multiprocessor communication
feature is enabled (SM2 bit in SCON register is set).
Implemented in hardware, automatic address recognition enhances the multiprocessor commu-
nication feature by allowing the Serial Port to examine the address of each incoming command
frame. Only when the Serial Port recognizes its own address, the receiver sets RI bit in SCON
register to generate an interrupt. This ensures that the CPU is not interrupted by command
frames addressed to other devices.
If desired, the automatic address recognition feature in mode 1 may be enabled. In this configu-
ration, the stop bit takes the place of the ninth data bit. Bit RI is set only when the received
command frame address matches the device’s address and is terminated by a valid stop bit.
To support automatic address recognition, a device is identified by a given address and a broad-
cast address.
Note:
Each device has an individual address that is specified in SADDR register; the SADEN register
is a mask byte that contains don’t care Bits (defined by zeros) to form the device’s given
The multiprocessor communication and automatic address recognition features cannot be
enabled in mode 0 (i.e, setting SM2 bit in SCON register in mode 0 has no effect).
CLOCK
PER
Baud_Rate =
÷ 2
SMOD1
PCON.7
0
1
2
SMOD1
32
⋅ F
÷ 16
PER
To Serial Port
4173E–USB–09/07