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ST72321 Datasheet(PDF) 96 Page - STMicroelectronics |
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ST72321 Datasheet(HTML) 96 Page - STMicroelectronics |
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96 / 189 page  ST72321 96/189 SERIAL PERIPHERAL INTERFACE (Cont’d) 10.5.8 Register Description CONTROL REGISTER (SPICR) Read/Write Reset Value: 0000 xxxx (0xh) Bit 7 = SPIE Serial Peripheral Interrupt Enable. This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SPI interrupt is generated whenever SPIF=1, MODF=1 or OVR=1 in the SPICSR register Bit 6 = SPE Serial Peripheral Output Enable. This bit is set and cleared by software. It is also cleared by hardware when, in master mode, SS=0 (see Section 10.5.5.1 Master Mode Fault (MODF)). The SPE bit is cleared by reset, so the SPI peripheral is not initially connected to the ex- ternal pins. 0: I/O pins free for general purpose I/O 1: SPI I/O pin alternate functions enabled Bit 5 = SPR2 Divider Enable. This bit is set and cleared by software and is cleared by reset. It is used with the SPR[1:0] bits to set the baud rate. Refer to Table 18 SPI Master mode SCK Frequency. 0: Divider by 2 enabled 1: Divider by 2 disabled Note: This bit has no effect in slave mode. Bit 4 = MSTR Master Mode. This bit is set and cleared by software. It is also cleared by hardware when, in master mode, SS=0 (see Section 10.5.5.1 Master Mode Fault (MODF)). 0: Slave mode 1: Master mode. The function of the SCK pin changes from an input to an output and the func- tions of the MISO and MOSI pins are reversed. Bit 3 = CPOL Clock Polarity. This bit is set and cleared by software. This bit de- termines the idle state of the serial Clock. The CPOL bit affects both the master and slave modes. 0: SCK pin has a low level idle state 1: SCK pin has a high level idle state Note: If CPOL is changed at the communication byte boundaries, the SPI must be disabled by re- setting the SPE bit. Bit 2 = CPHA Clock Phase. This bit is set and cleared by software. 0: The first clock transition is the first data capture edge. 1: The second clock transition is the first capture edge. Note: The slave must have the same CPOL and CPHA settings as the master. Bits 1:0 = SPR[1:0] Serial Clock Frequency. These bits are set and cleared by software. Used with the SPR2 bit, they select the baud rate of the SPI serial clock SCK output by the SPI in master mode. Note: These 2 bits have no effect in slave mode. Table 18. SPI Master mode SCK Frequency 70 SPIE SPE SPR2 MSTR CPOL CPHA SPR1 SPR0 Serial Clock SPR2 SPR1 SPR0 fCPU/4 1 0 0 fCPU/8 0 0 0 fCPU/16 0 0 1 fCPU/32 1 1 0 fCPU/64 0 1 0 fCPU/128 0 1 1 |
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