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14 Bit PIC Instruction Set

admin — Thu, 21 May 2009 16:52:37 +0000

The majority of devices in the PIC12 and PIC16 Midrange devices use this instruction set. It’s very similar to the 12 Bit PIC Instruction Set but the increased opcode width allows 128 registers and 2048 words of code to be directly addressed.

Opcode (binary)	Mnemonic	Description
`00 0000 0000 0000`	NOP	No operation
`00 0000 0000 1000`	RETURN	Return from subroutine, W unchanged
`00 0000 0000 1001`	RETFIE	Return from interrupt
`00 0000 0110 0010`	OPTION	Write W to OPTION register
`00 0000 0110 0011`	SLEEP	Go into standby mode
`00 0000 0110 0100`	CLRWDT	Reset watchdog timer
`00 0000 0110 01ff`	TRIS f	Write W to tristate register f

`00 0000 1 fffffff`	MOVWF f	Move W to f
`00 0001 0 xxxxxxx`	CLRW	Clear W to 0 (W = 0)
`00 0001 1 fffffff`	CLRF f	Clear f to 0 (f = 0)
`00 0010 d fffffff`	SUBWF f,d	Subtract W from f (d = f − W)
`00 0011 d fffffff`	DECF f,d	Decrement f (d = f − 1)
`00 0100 d fffffff`	IORWF f,d	Inclusive OR W with F (d = f OR W)
`00 0101 d fffffff`	ANDWF f,d	AND W with F (d = f AND W)
`00 0110 d fffffff`	XORWF f,d	Exclusive OR W with F (d = f XOR W)
`00 0111 d fffffff`	ADDWF f,d	Add W with F (d = f + W)
`00 1000 d fffffff`	MOVF f,d	Move F (d = f)
`00 1001 d fffffff`	COMF f,d	Complement f (d = NOT f)
`00 1010 d fffffff`	INCF f,d	Increment f (d = f + 1)
`00 1011 d fffffff`	DECFSZ f,d	Decrement f (d = f − 1) and skip if zero
`00 1100 d fffffff`	RRF f,d	Rotate right F (rotate right through carry)
`00 1101 d fffffff`	RLF f,d	Rotate left F (rotate left through carry)
`00 1110 d fffffff`	SWAPF f,d	Swap 4-bit halves of f (d = f<<4 \| f>>4)
`00 1111 d fffffff`	INCFSZ f,d	Increment f (d = f + 1) and skip if zero

`01 00 bbb fffffff`	BCF f,b	Bit clear f (Clear bit b of f)
`01 01 bbb fffffff`	BSF f,b	Bit set f (Set bit b of f)
`01 10 bbb fffffff`	BTFSC f,b	Bit test f, skip if clear (Test bit b of f)
`01 11 bbb fffffff`	BTFSS f,b	Bit test f, skip if set (Test bit b of f)

`10 0 kkkkkkkkkkk`	CALL k	Save return address, load PC with k
`10 1 kkkkkkkkkkk`	GOTO k	Jump to address k (11 bits)

`11 00xx kkkkkkkk`	MOVLW k	Move literal to W (W = k)
`11 01xx kkkkkkkk`	RETLW k	Set W to k and return
`11 1000 kkkkkkkk`	IORLW k	Inclusive or literal with W (W = k OR W)
`11 1001 kkkkkkkk`	ANDLW k	AND literal with W (W = k AND W)
`11 1010 kkkkkkkk`	XORLW k	Exclusive or literal with W (W = k XOR W)
`11 110x kkkkkkkk`	SUBLW k	Subtract W from literal (W = k − W)
`11 111x kkkkkkkk`	ADDLW k	Add literal to W (W = k + W)

12 Bit PIC Instruction Set

admin — Thu, 21 May 2009 16:32:46 +0000

Here’s the instruction set for Microchip’s Baseline devices. These include the PIC10 series as well as some of the PIC12 and PIC16.

Opcode (binary)	Mnemonic	Description
`0000 0000 0000`	NOP	No operation
`0000 0000 0010`	OPTION	Load OPTION register with contents of W
`0000 0000 0011`	SLEEP	Go into standby mode
`0000 0000 0100`	CLRWDT	Reset watchdog timer
`0000 0000 01ff`	TRIS f	Move W to port control register (f=1..3)

`0000 001 fffff`	MOVWF f	Move W to f
`0000 010 xxxxx`	CLRW	Clear W to 0 (a.k.a CLR x,W)
`0000 011 fffff`	CLRF f	Clear f to 0 (a.k.a. CLR f,F)
`0000 10d fffff`	SUBWF f,d	Subtract W from f (d = f − W)
`0000 11d fffff`	DECF f,d	Decrement f (d = f − 1)
`0001 00d fffff`	IORWF f,d	Inclusive OR W with F (d = f OR W)
`0001 01d fffff`	ANDWF f,d	AND W with F (d = f AND W)
`0001 10d fffff`	XORWF f,d	Exclusive OR W with F (d = f XOR W)
`0001 11d fffff`	ADDWF f,d	Add W with F (d = f + W)
`0010 00d fffff`	MOVF f,d	Move F (d = f)
`0010 01d fffff`	COMF f,d	Complement f (d = NOT f)
`0010 10d fffff`	INCF f,d	Increment f (d = f + 1)
`0010 11d fffff`	DECFSZ f,d	Decrement f (d = f − 1) and skip if zero
`0011 00d fffff`	RRF f,d	Rotate right F (rotate right through carry)
`0011 01d fffff`	RLF f,d	Rotate left F (rotate left through carry)
`0011 10d fffff`	SWAPF f,d	Swap 4-bit halves of f (d = f<<4 \| f>>4)
`0011 11d fffff`	INCFSZ f,d	Increment f (d = f + 1) and skip if zero

`0100 bbb fffff`	BCF f,b	Bit clear f (Clear bit b of f)
`0101 bbb fffff`	BSF f,b	Bit set f (Set bit b of f)
`0110 bbb fffff`	BTFSC f,b	Bit test f, skip if clear (Test bit b of f)
`0111 bbb fffff`	BTFSS f,b	Bit test f, skip if set (Test bit b of f)

`1000 kkkkkkkk`	RETLW k	Set W to k and return
`1001 kkkkkkkk`	CALL k	Save return address, load PC with k
`101 kkkkkkkkk`	GOTO k	Jump to address k (9 bits!)
`1100 kkkkkkkk`	MOVLW k	Move literal to W (W = k)
`1101 kkkkkkkk`	IORLW k	Inclusive or literal with W (W = k OR W)
`1110 kkkkkkkk`	ANDLW k	AND literal with W (W = k AND W)
`1111 kkkkkkkk`	XORLW k	Exclusive or literal with W (W = k XOR W)

Resistor Color Code Software

admin — Thu, 21 May 2009 15:36:23 +0000

There are three different types of resistor color coding. They vary by providing different information in a different number of color bands. I’ve looked around for a decent chart that I could share and stumbled upon this freeware. It’s provided by moyerelectronics.com. I’ve installed it and played with it and found it to be accurate. Here’s a screenshot and a download link.

resistorcolorcode24

Create a folder, and extract the contents of the zip file into it. Double click the setup.exe file and you’re all set.

Getting Started with PIC’s

admin — Sun, 17 May 2009 17:53:53 +0000

People often want to know how to get started programming PIC’s. Here’s a quick video which introduces you to the PICKit 2 programmer.

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