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TMP86CS64AFG Datasheet(PDF) 158 Page - Toshiba Semiconductor |
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TMP86CS64AFG Datasheet(HTML) 158 Page - Toshiba Semiconductor |
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158 / 202 page  Page 148 15. Synchronous Serial Interface (SIO1) 15.3 Serial clock TMP86CS64AFG 15.3.1.1 Internal clock Any of six frequencies can be selected. The serial clock is output to the outside on the SCK1 pin. The SCK1 pin goes high when transfer starts. When data writing (in the transmit mode) or reading (in the receive mode or the transmit/receive mode) cannot keep up with the serial clock rate, there is a wait function that automatically stops the serial clock and holds the next shift operation until the read/write processing is completed. Note: 1 Kbit = 1024 bit (fc = 16 MHz, fs = 32.768 kHz) Figure 15-3 Automatic Wait Function (at 4-bit transmit mode) 15.3.1.2 External clock An external clock connected to the SCK1 pin is used as the serial clock. In this case, output latch of this port should be set to "1". To ensure shifting, a pulse width of at least 4 machine cycles is required. This pulse is needed for the shift operation to execute certainly. Actually, there is necessary processing time for interrupting, writing, and reading. The minimum pulse is determined by setting the mode and the pro- gram. Therfore, maximum transfer frequency will be 488.3K bit/sec (at fc=16MHz). Table 15-1 Serial Clock Rate NORMAL1/2, IDLE1/2 mode SLOW1/2, SLEEP1/2 mode DV7CK = 0 DV7CK = 1 DV1CK = 0 DV1CK = 1 DV1CK = 0 DV1CK = 1 SCK Clock Baud Rate Clock Baud Rate Clock Baud Rate Clock Baud Rate Clock Baud Rate 000 fc/213 1.91 Kbps fc/214 0.95 Kbps fs/25 1024 bps fs/25 1024 bps fs/25 1024 bps 001 fc/28 61.04 Kbps fc/29 30.52 Kbps fc/28 61.04 Kbps fc/29 30.52 Kbps -- 010 fc/27 122.07 Kbps fc/28 61.04 Kbps fc/27 122.07 Kbps fc/28 61.04 Kbps -- 011 fc/26 244.14 Kbps fc/27 122.07 Kbps fc/26 244.14 Kbps fc/27 122.07 Kbps -- 100 fc/25 488.28 Kbps fc/26 244.14 Kbps fc/25 488.28 Kbps fc/26 244.14 Kbps -- 101 fc/24 976.56 Kbps fc/25 488.28 Kbps fc/24 976.56 Kbps fc/25 488.28 Kbps -- 110 ---- --- --- 111 External External External External External External External External External External a1 a2 b0 b1 b2 b3 c0 c1 a3 a c b a0 pin (output) pin (output) Written transmit data Automatically wait function SCK1 SO1 |
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