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ST70136B Datasheet(PDF) 9 Page - STMicroelectronics |
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ST70136B Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 24 page ST70136 9/24 Figure 2 : Digital Data Interface 4.7 - Control Serial Interface There is a 4-pin serial digital interface (CLKWD, CTRLIN, CTRLOUT, R/W) that access one of the 8 x 12-bit registers that controls all the program- mable features on the ST70136. The registers are loaded with the asynchronous type data burst delivered to CTRLIN pin. It is com- posed of 16 bits from which the first bit (b15) is used as start bit (‘0’), the three LSBs (b2:b0) being used to identify the register to be loaded. The twelve remaining bits (b14:b3) are the control data. During a read operation, the CTRLOUT pin figures out the register contents addressed by CTRLIN pin. CLKM CLKWD TX[0]/RX[0] TX[1]/RX[1] 35.328MHz 8.832MHz TX[2]/RX[2] TX[3]/RX[3] Sign DATA..................................................................................LSB a15 a0 TX DATA Sign Sign DATA.................................................................... 0 0 0 a15 RX DATA a13 a9 a5 a12 a8 a4 a15 a11 a7 a3 a14 a10 a6 a2 a1 a0 a14 a13 a2 a14 a13 a0 a1 Figure 3 : Control Register Interface Write Cycle CLKM CLKWD Data for write access [b14:b3] [b2:b0] CTRLIN b15 CTRLOUT R/NW |
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