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M66014FP Datasheet(PDF) 3 Page - Renesas Technology Corp |
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M66014FP Datasheet(HTML) 3 Page - Renesas Technology Corp |
3 / 5 page M66014FP REJ03F0265-0200 Rev.2.00 Mar 18, 2008 Page 3 of 4 Serial Data Input/Output Operation A cycle of 16-bit serial output data setting and serial data communication starts with a write access given by microcomputer to transmission shift registers in M66014. M66014 has two 8-bit shift registers, on for upper byte (SRU), the other for lower byte (SRL). If the CS status rises from "L" to "H" after a write access is given to SRL, serial data communication is started. SRU 8-bit data and SRL 8-bit data are output in series in this order. Output of each data starts from its most significant bit. At the CS rise edge, busy flag in M66014 is set, and OE output shifts from "H" to "L". Shift clock SCLK and serial data SOUT are then output. At SCLK fall edges, serial output shift register executes shifting operation, and data on shift register is output in series from pin SOUT. Serial input data from pin SIN is taken into input shift register at SCLK rise edges. After the SCLK 16T rise edge, the status of SOUT and OE shifts to "H" after one bit's delay of SCLK, and busy flag is reset. When interrupt output is being set to enable, INT output is set. Remarks (1) If CS rises after write operation is executed on SR L only and not on SRU, SRU data is unstable. (2) When write operations executed on SRL, M66014 becomes ready for start of serial communication and stands by for detection of CS rise. However, if a read access is given after data is written on SR L while CS is maintained on "L" level, this standby status is canceled. To resume serial communication in this case, rewrite data on SRL and raise CS. SRL write operation Serial communication period INT 1T DO15 (D7U) (D7L)(D0L) (D0U) DO14 DO13 DO12 DO11 DO10 DO9 DO8 DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8 DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 2T 8T 9T 16T SCLK SOUT SIN Busy flag (in M66014) CS OE Figure 1 Serial Communication Timing Chart |
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