
14-6
ML63326 User's Manual
Chapter 14 Shift Register (SFT)
14.5 Shift Register Application Example
An example of register setting for clock synchronous communication using shift register is
described below.
(1) Set the supported port modes (secondary function).
Port control
register
Master mode
Bit 2 = "1"
Bit 1 = "1"
PEMOD
(PE.2/SCLK)
(PE.1/SOUT)
Bit 0 = "1"
(PE.0/SIN)
(2) Select the shift clock with SELCK1, SELCK0 (SFTCON0 bits 1, 0)(master/slave mode
select).
(3) Select MSB first or LSB first with SDIR (SFTCON0 bit 2). ("0" for MSB first, "1" for LSB first).
(4) Set ESFT (IE3 bit 2) to "1" and enable the shift register interrupt.
(5) Set the MIE (master interrupt enable flag) to "1", and enable all interrupts.
(6) Write send data to SFTRL and SFTRH.
(7) Set ENTR (bit 0 of SFTCON1) to "1", and start the transfer.
With the above settings the shift register begins to operate, and the CPU receives the shift
register interrupt. Whether 8-bit transfer has been completed can be checked by monitoring
QSFT (bit 2 of IRQ3) or ENTR (bit 0 of SFTCON1).
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