3.3.20. SCICLKICC: [8] (+0x4c)

SCICLKICC is the external Smart Card clock frequency register and contains the divisor used to generate the Smart Card clock frequency.

The Smart Card clock frequency (F) is generated by dividing the reference clock by (SCICLKICC + 1) and then dividing again by 2.

Figure 3.1. Smart card frequency

If SCICLKICC is set to 0, F = refclock /2.

If SCICLKICC is set to 1, F = refclock/4.

SCICLKICC is an 8-bit register that must be programmed with a value between 0 and 255 before SCICLK is enabled. Table 3.22 shows bit assignments for SCICLKICC.

Table 3.22. SCICLKICC register read/write bits

Bits

Name

Type

Function

7:0

CLKICC

Read/write

Defines the Smart Card clock frequency.

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