The subroutine call instruction CALL is numbered FNC01. The operands are P0~P127, and this instruction occupies 3 program steps. The subroutine return instruction SRET is numbered FNC02. No operands, taking up 1 program step. As shown in Fig. 1, if X0 is turned on, it goes to the label P10 to execute the subroutine. When the SRET instruction is executed, it returns to the next execution of the CALL instruction. 
Figure 1 Use of subroutine call and return instruction When using subroutine call and return instruction, please note: 1) The transfer label cannot be repeated, and it cannot be repeated with the label of the jump instruction; 2) The subroutine can be nested and called up to 5 Level nesting.
Reverse Conducting Thyristor(RCT)
Reverse Conducting Thyristor(RCT) is also called Reverse- appreciation Thyristor.The characteristic is that a diode is connected in reverse parallel between the anode and cathode of thyristor, so that the transmitting junction of anode and cathode is short-circuited.As a result of this special circuit structure, it has high voltage resistance, high temperature resistance, short turn-off time, low switching voltage and other good performance.For example, the turn-off time of the reverse thyristor is only a few microseconds, and the working frequency is dozens of KHZ, which is better than the fast thyristor (FSCR).This device is suitable for switching power supply and UPS uninterrupted power supply. One RCT can replace one thyristor and one continuous current diode respectively.
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