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11-11
MINIMUM HARDWARE CONSIDERATIONS
11.6.2 Issuing the Reset (RST) Instruction
The RST instruction (opcode FFH) resets the device by pulling RESET# low for 16 state times.
It also clears the processor status word (PSW), sets the extended and master program counters
(EPC/PC) to FF2080H, and resets the special function registers (SFRs). See Table C-2 on page
C-2 for the reset values of the SFRs.
11.6.3 Issuing an Illegal IDLPD Key Operand
The device resets itself if an illegal key operand is used with the idle/powerdown (IDLPD) com-
mand. The legal keys are “1” for idle mode, “2” for powerdown mode, and “3” for standby mode
(NU only). If any other value is used, the device executes a reset sequence. (See Appendix A for
a description of the IDLPD command.)