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參數(shù)資料
| 型號： | P89C664HBBD |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 80C51 8-bit Flash microcontroller family |
| 中文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-389-1, LQFP-44 |
| 文件頁數(shù)： | 15/89頁 |
| 文件大?。?/td> | 491K |
| 代理商： | P89C664HBBD |
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Philips Semiconductors
Product data
P89C660/P89C662/P89C664/
P89C668
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM
2002 Oct 28
15
Arbitration and Synchronization Logic
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 4 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 5 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.
ACK
1. Another device transmits identical serial data.
SDA
1
2
3
4
8
9
SCL
(1)
(1)
(2)
(3)
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.
SU00967
Figure 4. Arbitration Procedure
(1)
SCL
(3)
(1)
SDA
MARK
DURATION
SPACE DURATION
(2)
1. Another service pulls the SCL line low before the SIO1 “mark” duration is complete. The serial clock generator is immediately
reset and commences with the “space” duration by pulling SCL low.
2. Another device still pulls the SCL line low after SIO1 releases SCL. The serial clock generator is forced into the wait state
until the SCL line is released.
3. The SCL line is released, and the serial clock generator commences with the mark duration.
SU00968
Figure 5. Serial Clock Synchronization
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| P89C662 | 80C51 8-Bit Flash Microcontroller 32KB ISP/IAP FLASH with 1KB RAM(80C51 8位閃速微控制器，帶16KB ISP/IAP閃速存儲器和1KB RAM) |
| P89C668HBA | 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM |
| P89C668HFA | 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM |
| P89C668 | 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM |
| P89C668HBBD | 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P89C664HBBD/00,557 | 功能描述:8位微控制器 -MCU 64K/2K FL 6 CLK ISP/IAP COM 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 |
| P89C664HFA | 制造商:PHIL 功能描述: |
| P89C664HFA/00,512 | 功能描述:8位微控制器 -MCU 64K/2K FL 6 CLK ISP/IAP IND 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 |
| P89C664HFBD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit Flash microcontroller family |
| P89C664HFBD/00,557 | 功能描述:8位微控制器 -MCU 64K/2K FL 6CLK ISP/IAP QFP IND 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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