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M34F04-WMN6TP Datasheet(PDF) 11 Page - STMicroelectronics |
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M34F04-WMN6TP Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 20 page 11/20 M34F04 Figure 9. Read Mode Sequences Note: 1. The seven most significant bits of the Device Select Code of a Random Read (in the 1st and 3rd bytes) must be identical. Read Operations Read operations are performed independently of the state of the Write Control (WC) signal. Random Address Read A dummy Write is performed to load the address into the address counter (as shown in Figure 9) but without sending a Stop condition. Then, the bus master sends another Start condition, and repeats the Device Select Code, with the RW bit set to 1. The device acknowledges this, and outputs the contents of the addressed byte. The bus master must not acknowledge the byte, and terminates the transfer with a Stop condition. Current Address Read The device has an internal address counter which is incremented each time a byte is read. For the Current Address Read operation, following a Start condition, the bus master only sends a Device Se- lect Code with the RW bit set to 1. The device ac- knowledges this, and outputs the byte addressed by the internal address counter. The counter is then incremented. The bus master terminates the transfer with a Stop condition, as shown in Figure 9, without acknowledging the byte. Sequential Read This operation can be used after a Current Ad- dress Read or a Random Address Read. The bus DEV SEL * BYTE ADDR DEV SEL DATA OUT 1 AI01942 DATA OUT N CURRENT ADDRESS READ DEV SEL DATA OUT RANDOM ADDRESS READ DEV SEL * DATA OUT SEQUENTIAL CURRENT READ DATA OUT N DEV SEL * BYTE ADDR SEQUENTIAL RANDOM READ DEV SEL * DATA OUT 1 ACK R/W NO ACK ACK R/W ACK ACK R/W ACK ACK ACK NO ACK R/W NO ACK ACK ACK R/W ACK ACK R/W ACK NO ACK |
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