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PCA8802CX8 Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA8802CX8 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 34 page PCA8802_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 19 February 2009 9 of 34 NXP Semiconductors PCA8802 Smartcard RTC 9.5.1.2 The reading protocol The reading protocol is shown in Figure 11. 9.5.1.3 Reading and writing limitations As the counter is frozen during interface accesses, all access must be completed within 32 seconds (see Figure 12). If this rule is not adhered to, then counts will be dropped. Wrt_cmd is slave address plus write bit. Fig 10. Writing protocol 001aaj213 S wrt_cmd writing 2 consecutive instructions writing 2 consecutive instructions with instruction parameters S START condition P STOP condition A acknowledge from slave A instruction A instruction A S wrt_cmd A instruction A instr. parameter 1 A instr. parameter 2 A instr. parameter 3 A instruction A P P Rd_cmd is slave address plus read bit. Fig 11. Reading protocol 001aaj207 S rd_cmd 1st parameter reading multiple data parameters S START condition P STOP condition A acknowledge from slave A acknowledge from master A not acknowledge from master A 2nd parameter A3rd parameter A4th parameter Anth parameter AP A Wrt_cmd is slave address plus write bit. Rd_cmd is slave address plus read bit. Fig 12. Access restrictions 001aaj205 wrt_cmd/ rd_cmd instruction transfer must be < 32 seconds S START condition P STOP condition A acknowledge from slave P A S |
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