Intel 8XC196NP, 80C196NU, Microcontroller manual Extb SIGN-EXTEND SHORT-INTEGER Into

8XC196NP, 80C196NU USER’S MANUAL

Table A-6. Instruction Set (Continued)

Mnemonic				Operation						Instruction Format
EXTB	SIGN-EXTEND SHORT-INTEGER INTO
	INTEGER. Sign-extends the low-order byte								EXTB	wreg
	of the operand throughout the high-order byte
									(00010110) (wreg)
	of the operand.
	if DEST.7 = 1 then				← 0FFH
	(high byte DEST)
	else				← 0
	(high byte DEST)
	end_if
			PSW Flag Settings
		Z	N	C		V	VT	ST
		✓	✓	0		0	—	—
IDLPD	IDLE/POWERDOWN. Depending on the 8-bit
	value of the KEY operand, this instruction								IDLPD	#key
	causes the device
									(11110110) (key)

∙to enter idle mode, KEY=1,

∙to enter powerdown mode, KEY=2,

∙to enter standby mode, KEY=3, (NU only)

∙to execute a reset sequence,

KEY = any value other than 1 or 2 (NP) or 1, 2, or 3 (NU).

The bus controller completes any prefetch cycle in progress before the CPU stops or resets.

if KEY = 1 then enter idle

else if KEY = 2 then enter powerdown else if KEY = 3 then

enter standby (NU only) else

execute reset

PSW Flag Settings

Z	N	C	V	VT	ST
	KEY = 1 or 2 (NP)
	or 1, 2, or 3 (NU)
—	—	— —	—	—

KEY = any value other than 1 or 2 (NP) or 1, 2, or 3 (NU)

0 0 0 0 0 0

A-20