參數(shù)資料
型號(hào)： P80C591
廠商： NXP Semiconductors N.V.
英文描述： Single-chip 8-bit microcontroller with CAN controller
中文描述： 單芯片8 - CAN控制器位微控制器
文件頁數(shù)： 79/161頁
文件大?。?/td> 588K
代理商： P80C591
1999 Aug 19
79
Philips Semiconductors
Objective Specification
Single-chip 8-bit microcontroller with CAN controller
P8xC591
15.2.5
A
RBITRATION AND
S
YNCHRONIZATION
L
OGIC
In the master transmitter mode, the arbitration logic checks
that every transmitted logic 1 actually appears as a logic 1
on the I
2
C bus. If another device on the bus overrules a
logic 1 and pulls the SDA line low, arbitration is lost, and
SIO1 immediately changes from master transmitter to
slave receiver. SIO1 will continue to output clock pulses
(on SCL) until transmission of the current serial byte is
complete.
Arbitration may also be lost in the master receiver mode.
Loss of arbitration in this mode can only occur while SIO1
is returning a not acknowledge: (logic 1) to the bus.
Arbitration is lost when another device on the bus pulls this
signal LOW. Since this can occur only at the end of a serial
byte, SIO1 generates no further clock pulses. Figure 33
shows the arbitration procedure.
The synchronization logic will synchronize the serial clock
generator with the clock pulses on the SCL line from
another device. If two or more master devices generate
clock pulses, the mark duration is determined by the
device that generates the shortest marks, and the space
duration is determined by the device that generates the
longest spaces. Figure 34 shows the synchronization
procedure.
A slave may stretch the space duration to slow down the
bus master. The space duration may also be stretched for
handshaking purposes. This can be done after each bit or
after a complete byte transfer. SIO1 will stretch the SCL
space duration after a byte has been transmitted or
received and the acknowledge bit has been transferred.
The serial interrupt flag (SI) is set, and the stretching
continues until the serial interrupt flag is cleared.
Fig.33 Arbitration Procedure.
handbook, full pagewidth
MHI034
SDA
SCL
1
2
3
4
8
9
ACK
(2)
(1)
(1)
(3)
(1) Another device transmits identical serial data.
(2) Another device overrules a logic 1 (dotted line) transmitted by SIO1 (master) by pulling the SDA line low. Arbitration is lost,
and SIO1 enters the slave receiver mode.
(3) SIO1 is in the slave receiver mode but still generates clock pulses until the current byte has been transmitted. SIO1 will not
generate clock pulses for the next byte. Data on SDA originates from the new master once it has won arbitration.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P80C591SFA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller with CAN controller
P80C591SFB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller with CAN controller
P80C592 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with on-chip CAN
P80C592FFA 制造商:NXP Semiconductors 功能描述:
P80C592FFA/00,512 功能描述:8位微控制器 -MCU 80C51 W/CAN 16MHZ ROMLESS RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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