MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

16-Bit C Compiler User’s Guide
__builtin_write_RTCWEN
Description: Used to write to the RTCC Timer by implementing the unlock sequence
by writing the correct unlock values to NVMKEY and then setting the
RTCWREN bit of RCFGCAL SFR.
Prototype: void __builtin_write_RTCWEN(void);
Argument: None.
Return Value: None.
Assembler Operator
/ Machine
Instruction:
Error Messages None.
mov #0x55, Wn
mov Wn, _NVMKEY
mov #0xAA, Wn
mov Wn, _NVMKEY
bset _NVMVON, #15
nop
nop
__builtin_write_OSCCONL
Description: Unlocks and writes its argument to OSCCONL.
Prototype: void __builtin_write_OSCCONL(unsigned char value);
Argument: value character to be written
Return Value: None.
Assembler Opera- mov #0x46, w0
tor / Machine mov #0x57, w1
Instruction*: mov __OSCCON, w2
mov.b w0, [w2]
mov.b w1, [w2]
mov.b value, [w2]
Error Messages None.
* The exact sequnce may be different.
__builtin_write_OSCCONH
Description: Unlocks and writes its argument to OSCCONH.
Prototype: void __builtin_write_OSCCONH(unsigned char value);
Argument: value character to be written
Return Value: None.
Assembler Opera- mov #0x78, w0
tor / Machine mov #0x9A, w1
Instruction*: mov __OSCCON+1, w2
mov.b w0, [w2]
mov.b w1, [w2]
mov.b value, [w2]
Error Messages None.
* The exact sequnce may be different.
DS51284G-page 162 © 2008 Microchip Technology Inc.