參數(shù)資料
型號： 8XC51
廠商： Intel Corp.
英文描述： CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
中文描述： CHMOS單片8位微控制器
文件頁數(shù)： 20/58頁
文件大?。?/td> 233K
代理商： 8XC51
2003 Oct 30
20
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
address. Two special function registers are used to define
the slave addresses, SADDR, and the address mask,
SADEN.SADENisusedtodefinewhichbitsintheSADDR
are to be used and which bits are ‘don’t cares’. The
SADEN mask can be logically AND-ed with the SADDR to
create the given address which the master will use for
addressing each of the slaves. Use of the given address
allows multiple slaves to be recognized while excluding
others. The following examples will help to show the
versatility of this scheme.
Table 15
Slave 0
Table 16
Slave 1
In the above example SADDR is the same and the SADEN
data is used to differentiate between the two slaves.
Slave 0 requires that bit 0 = 0 and ignores bit 1. Slave 1
requires that bit 1 = 0 and bit 0 is ignored. A unique
address for slave 0 would be 1100 0010 since slave 1
requires bit 1 = 0. A unique address for slave 1 would be
1100 0001 since bit 0 = 1 will exclude slave 0. Both slaves
can be selected at the same time by an address which has
bit 0 = 0 (for slave 0) and bit 1 = 0 (for slave 1). Thus, both
could be addressed with 1100 0000.
In a more complex system the following could be used to
select slaves 1 and 2 while excluding slave 0.
Table 17
Slave 0
Table 18
Slave 1
Table 19
Slave 2
In the above example the differentiation among the
3 slaves is in the lower 3 address bits. Slave 0 requires
that bit 0 = 0 and it can be uniquely addressed by
1110 0110. Slave 1 requires that bit 1 = 0 and it can be
uniquely addressed by 1110 and 0101. Slave 2 requires
that bit 2 = 0 and its unique address is 1110 0011.
To select slaves 0 and 1 and exclude slave 2 use address
1110 0100, since it is necessary to make bit 2 = 1 to
exclude slave 2.
The broadcast address for each slave is created by taking
the logical OR of SADDR and SADEN. Zeros in this result
are treated as don’t cares. In most cases, interpreting the
don’t cares as ones, the broadcast address will be FFh.
Upon reset SADDR (SFR address 0A9h) and SADEN
(SFR address 0B9h) are leaded with 0s. This produces a
given address of all ‘don’t cares’ as well as a broadcast
address of all ‘don’t cares’. This effectively disables the
automaticaddressingmodeandallowsthemicrocontroller
to use standard 80C51 type UART drivers which do not
make use of this feature.
REGISTER
VALUE (BINARY)
SADDR
SADEN
Given
1100 0000
1111 1101
1100 00X0
REGISTER
VALUE (BINARY)
SADDR
SADEN
Given
1100 0000
1111 1110
1100 000X
REGISTER
VALUE (BINARY)
SADDR
SADEN
Given
1100 0000
1111 1001
1100 0XX0
REGISTER
VALUE (BINARY)
SADDR
SADEN
Given
1110 0000
1111 1010
1110 0X0X
REGISTER
VALUE (BINARY)
SADDR
SADEN
Given
1110 0000
1111 1100
1110 00XX
相關(guān)PDF資料
PDF描述
8XC51GB-1 CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
8XC51SL.LOWVOLTAGE8XC51SL KEYBOARD CONTROLLER
8XC51SLLOWVOLTAGE8XC51SL KEYBOARD CONTROLLER
8XC52 80C51 8-Bit Microcontroller Family (8K ROM,Low Voltage (2.7V-5.5V), Low Power, High Speed (33 MHz) )(80C51 8位微控制器系列產(chǎn)品)
8XC54 80C51 8-bit microcontroller family 8K-64K/256-1K OTP/ROM/ROMless, low voltage 2.7V-5.5V), low power, high speed (33 MHz)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
8XC51FA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit CMOS (low voltage, low power and high speed) microcontroller families
8XC51FA/FB/FC/80C51FA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:(360.35 k)
8XC51FB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power single card reader
8XC51FC 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit CMOS (low voltage, low power and high speed) microcontroller families
8XC51FX 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
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