gen_a_upmethod : R/W; bitpos: [3:0]; default: 0; Update method for PWM generator time stamp A's active register. When all bits are set to 0: immediately, when bit0 is set to 1: TEZ, when bit1 is set to 1: TEP,when bit2 is set to 1: sync, when bit3 is set to 1: disable the update.