EM357-RTR datasheet(90/240 Pages) ETC2

Nome de Peças	EM357-RTR

Descrição Electrónicos	High-Performance, Integrated ZigBee/802.15.4 System-on-Chip

PDF	240 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ETC2 [List of Unclassifed Manufacturers]

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90 / 240 page

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

375 kbps

400 kbps

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

EM357-RTR Folha de dados(PDF) 90 Page - List of Unclassifed Manufacturers