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EM357-RTR 数据表(PDF) 90 Page - List of Unclassifed Manufacturers

部件名 EM357-RTR
功能描述  High-Performance, Integrated ZigBee/802.15.4 System-on-Chip
PDF  240 Pages
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制造商  ETC2 [List of Unclassifed Manufacturers]
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标志 ETC2 - List of Unclassifed Manufacturers

EM357-RTR 数据表(HTML) 90 Page - List of Unclassifed Manufacturers

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EM351 / EM357
EXP is the value written to the SCx_RATEEXP register and LIN is the value written to the SCx_RATELIN register.
Table 8-8 shows the rate settings for Standard-Mode TWI (100 kbps) and Fast-Mode TWI (400 kbps) operation.
Table 8-8. TWI Clock Rate Programming
Clock Rate
SCx_RATELIN
SCx_RATEEXP
100 kbps
14
3
375 kbps
15
1
400 kbps
14
1
Note:
At 400 kbps, the Philips I2C Bus specification requires the minimum low period of SCL to be 1.3 µs, but
on the EM35x it is 1.25 µs. If a slave device requires strict compliance with SCL timing, the clock rate must be
lowered to 375 kbps.
The EM35x supports clock stretching. The slave device can hold SCL low on any received or transmitted data
bit. This inhibits further data transfers until SCL is allowed to go high again.
8.5.3
Constructing Frames
The TWI master controller supports generating various frame segments by means of the SC_TWISTART,
SC_TWISTOP, SC_TWISEND, and SC_TWIRECV bits in the SCx_TWICTRL1 registers. Table 8-9 summarizes these
frames.
8-19
120-035X-000D
Preliminary



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