Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1381

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5. Optionally, configure the μDMA channel (see
SSI:DMACR register.
6. Enable the SSI by setting the SSE bit in the SSI:CR1 register.
As an example, assume that the SSI configuration is required to operate with the following parameters:
• Master operation
• Texas Instruments SSI mode
• 1-Mbps bit rate
• 8 data bits
Assuming the system clock is 48 MHz, the bit rate calculation is shown in
SSIn_CLK = PERDMACLK / (CPSDVSR × (1 + SCR)) 1 × 106 = 20 × 106 / (CPSDVSR × (1 + SCR))1000000 bps =
48000000 Hz / (2 × (1 + 23))
In this case, if CPSDVSR = 0x2, SCR must be 0x18.
The configuration sequence is:
1. Ensure that the SSE bit in the SSI:CR1 register is clear.
2. Write the SSI:CR1 register with a value of 0x0000 0000.
3. Write the SSI:CPSR register with a value of 0x0000 0002.
4. Write the SSI:CR0 register with a value of 0x0000 1817.
5. The SSI is then enabled by setting the SSE bit in the SSI:CR1 register.
SWCU117C – February 2015 – Revised September 2015
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Chapter
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Initialization and Configuration
12, µDMA) and enable the DMA options in the
Equation
Synchronous Serial Interface (SSI)
6.
(6)
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