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AT85C5122D-RDRUM データシート(PDF) 46 Page - ATMEL Corporation |
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AT85C5122D-RDRUM データシート(HTML) 46 Page - ATMEL Corporation |
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46 / 208 page  46 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 SCIB Clock The Smart Card Interface Block (SCIB) uses two clocks : – The first one, CK_IDLE, is the peripheral clock used for the interface with the microcontroller. – The second one, CK_ISO, is independant from the CPU clock and is generated from the PLL or XTAL1 output. PR2, a 6-bit prescaler, will be used to generate: 12/9.6/8/6.85/6/5.33/4.8/4.36/ ..../1MHz frequencies. SCIB clock frequency must be lower than CPU clock frequency. During SCIB Reset, the CK_ISO input must be in the range 1 - 5 MHz according to ISO 7816. The SCIB clocks frequency is defined in Figure 41 on page 72 and Table 42 on page 72. Two conditions must be met for a correct use of the SCIB: • CK_CPU > 4/3 * CK_ISO and • CK_CPU < 6 * CK_ISO. 96 MHz CPU frequency 24 MHz PLL 1/4 Prescaler 48 MHz 1/2 External Clock CPU frequency 24 MHz (Equivalent to) X1 mode selected 24 MHz CPU frequency 24 MHz (Equivalent to) X2 mode selected PERIPH frequency 24 MHz PERIPH frequency 24 MHz PERIPH frequency 24 MHz External Clock |
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