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M37151M6 Datasheet(PDF) 27 Page - Renesas Technology Corp |
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M37151M6 Datasheet(HTML) 27 Page - Renesas Technology Corp |
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27 / 138 page  M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP Rev.1.00 Nov 01, 2002 page 27 of 136 REJ03B0129-0100Z Internal clock : The serial I/O counter is set to “7” during the write cycle into the serial I/O register (address 00EA16), and the transfer clock goes HIGH forcibly. At each falling edge of the transfer clock after the write cycle, serial data is output from the SOUT pin. Transfer direction can be selected by bit 5 of the serial I/O mode register. At each rising edge of the transfer clock, data is input from the SIN pin and data in the serial I/O register is shifted 1 bit. After the transfer clock has counted 8 times, the serial I/O counter becomes “0” and the transfer clock stops at HIGH. At this time the interrupt request bit is set to “1.” Fig. 8.5.2 Serial I/O Timing (for LSB first) Synchronous clock Transfer clock Serial I/O register write signal Serial I/O output SOUT D0 D1 D2 D3 D4 D5 D6 D7 (Note) Serial I/O input SIN Note : When an internal clock is selected, the SOUT pin is at high-impedance after transfer is completed. Interrupt request bit is set to “1” External clock : The an external clock is selected as the clock source, the interrupt request is set to “1” after the transfer clock has been counted 8 counts. However, transfer operation does not stop, so the clock should be controlled externally. Use the external clock of 1 MHz or less with a duty cycle of 50%. The serial I/O timing is shown in Figure 8.5.2. When using an exter- nal clock for transfer, the external clock must be held at HIGH for initializing the serial I/O counter. When switching between an inter- nal clock and an external clock, do not switch during transfer. Also, be sure to initialize the serial I/O counter after switching. Notes 1: On programming, note that the serial I/O counter is set by writing to the serial I/O register with the bit managing instructions, such as SEB and CLB. 2: When an external clock is used as the synchronous clock, write trans- mit data to the serial I/O register when the transfer clock input level is HIGH. |
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