AT89C5132-ROTIL Atmel, AT89C5132-ROTIL Datasheet - Page 115

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

Specifications of AT89C5132-ROTIL

• 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

18.6.2
4173E–USB–09/07
Broadcast Address
address. The don’t care Bits provide the flexibility to address one or more slaves at a time. The
following example illustrates how a given address is formed.
To address a device by its individual address, the SADEN mask byte must be 1111 1111b.
For example:
The following is an example of how to use given addresses to address different slaves:
The SADEN byte is selected so that each slave may be addressed separately.
For slave A, bit 0 (the LSB) is a don’t-care bit; for slaves B and C, bit 0 is a 1. To communicate
with slave A only, the master must send an address where bit 0 is clear (e.g. 1111 0000B).
For slave A, bit 1 is a 0; for slaves B and C, bit 1 is a don’t care bit. To communicate with slaves
A and B, but not slave C, the master must send an address with bits 0 and 1 both set (e.g.
1111 0011B).
To communicate with slaves A, B and C, the master must send an address with bit 0 set, bit 1
clear, and bit 2 clear (e.g. 1111 0001B).
A broadcast address is formed from the logical OR of the SADDR and SADEN registers with
zeros defined as don’t-care bits, e.g.:
The use of don’t-care bits provides flexibility in defining the broadcast address, however in most
applications, a broadcast address is FFh.
The following is an example of using broadcast addresses:
For slaves A and B, bit 2 is a don’t care bit; for slave C, bit 2 is set. To communicate with all of
the slaves, the master must send the address FFh.
To communicate with slaves A and B, but not slave C, the master must send the address FBh.
SADDR = 0101 0110b
SADEN = 1111 1100b
Given = 0101 01XXb
Slave A: SADDR = 1111 0001b
Slave B: SADDR = 1111 0011b
Slave C: SADDR = 1111 0011b
Slave A: SADDR = 1111 0001b
Slave B: SADDR = 1111 0011b
Slave C: SADDR = 1111 0010b
SADEN = 1111 1010b
Given = 1111 0X0Xb
SADEN = 1111 1001b
Given = 1111 0XX1b
SADEN = 1111 1101b
Given = 1111 00X1b
SADDR = 0101 0110b
SADEN = 1111 1100b
(SADDR | SADEN)=1111 111Xb
SADEN = 1111 1010b
Given = 1111 1X11b,
SADEN = 1111 1001b
Given = 1111 1X11b,
SADEN = 1111 1101b
Given = 1111 1111b,
AT89C5132
115