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W55P241 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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W55P241 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 32 page W55P241 - 6 - 5.1.1 Physical Connection The uC master may connect up to 2 slave devices as shown in the following figure. The W55P241 always operates in the slave mode. The master can be a microcontroller with 4 I/O pads or a dedicated SPI H/W. Each time the master wants to talk to one of the slaves, bit6 of command byte must be correctly specified. Slaves are identified by the DIS pad status. The master communicates with the slave via 4 SPI pads. In addition to bit6 of command byte, /CS must be asserted (low active) for W55P241 to receive the command. The W55P241 CLK runs on up to 10MHz. DI (master data output, slave data input) and DO (master data input, slave data output) exchange data between the microcontroller and the W55P241. To wake up the microcontroller, the WAKEUP or DO pad may connect to its one additional wakeup-enabled pad. /CS CLK DI DO /CS CLK DO DI /CS CLK DI DO WAKEUP Master uC WAKEUP Slave 0 Slave 1 DIS DIS WAKEUP “ 0” “ 1” SPI Control Interface Figure 2 Connection of Master and Slave 5.1.2 Mode 0 Generally, the master’s dedicated SPI H/W (hardware) may support up to 4 SPI operation modes, which are determined by the CLK’s idle state and phase (rising edge and falling edge). In the W55P241, only mode 0 is supported. For both master and slave, data is transmitted on the falling edge of CLK and data is received (sampled) on the rising edge of CLK. CLK keeps “0” before the 1 st rising edge and after the last falling edge. |
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