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M41T11MH6F Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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M41T11MH6F Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 29 page M41T11 Operation 11/29 2.2 Read mode In this mode, the master reads the M41T11 slave after setting the slave address (see Figure 8). Following the write mode control bit (R/W = 0) and the acknowledge bit, the word address An is written to the on-chip address pointer. Next the START condition and slave address are repeated, followed by the READ mode control bit (R/W = 1). At this point, the master transmitter becomes the master receiver. The data byte which was addressed will be transmitted and the master receiver will send an acknowledge bit to the slave transmitter (see Figure 9). The address pointer is only incremented on reception of an acknowledge bit. The M41T11 slave transmitter will now place the data byte at address An + 1 on the bus. The master receiver reads and acknowledges the new byte and the address pointer is incremented to An + 2. This cycle of reading consecutive addresses will continue until the master receiver sends a STOP condition to the slave transmitter. An alternate READ mode may also be implemented, whereby the master reads the M41T11 slave without first writing to the (volatile) address pointer. The first address that is read is the last one stored in the pointer (see Figure 10 on page 12). Table 2. AC characteristics Symbol Parameter(1) 1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5 V (except where noted). Min Max Unit fSCL SCL clock frequency 0 100 kHz tLOW Clock low period 4.7 µs tHIGH Clock high period 4 µs tR SDA and SCL rise time 1 µs tF SDA and SCL fall time 300 ns tHD:STA START condition hold time (after this period the first clock pulse is generated) 4µs tSU:STA START condition setup time (only relevant for a repeated start condition) 4.7 µs tSU:DAT Data setup time 250 ns tHD:DAT (2) 2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max.) of the falling edge of SCL. Data hold time 0 µs tSU:STO STOP condition setup time 4.7 µs tBUF Time the bus must be free before a new transmission can start 4.7 µs |
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