AT89C5132 Atmel Corporation, AT89C5132 Datasheet - Page 115
AT89C5132
Manufacturer Part Number
AT89C5132
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89C5132.pdf
(3 pages)
2.AT89C5132.pdf
(182 pages)
3.AT89C5132.pdf
(38 pages)
4.AT89C5132.pdf
(33 pages)
Specifications of AT89C5132
Flash (kbytes)
64 Kbytes
Max. Operating Frequency
20 MHz
Cpu
8051-12C
Max I/o Pins
44
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Uart
1
Adc Channels
2
Adc Resolution (bits)
10
Adc Speed (ksps)
22.7
Sram (kbytes)
2.25
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 3.6
Timers
2
Isp
UART/USB
Watchdog
Yes
Available stocks
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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
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