19. In Immediate Addressing Mode, the second byte (source operand) of the instruction is a(n) a. opcode c. immediate data value b. label d. N/A 20. The CPU of the 8051 cannot ignore which interrupt? a. Serial c. Reset b. Timer d. N/A 21. In the 8051, which addressing mode is used for pushing onto the stack? Immediate Addressing Mode Relative Addressing Mode a. c. b. Register Addressing Mode d. Direct Addressing Mode 22. Which register is -128 to +127 bytes from its target address (relative address)? a. Data Pointer c. TMOD Register b. Accumulator d. Program Counter