Datasheet

PIC24F04KA201 FAMILY
DS39937B-page 60 Preliminary © 2009 Microchip Technology Inc.
REGISTER 7-1: SR: ALU STATUS REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 R-0, HSC
— — — — — — — DC
(1)
bit 15 bit 8
R/W-0, HSC R/W-0, HSC R/W-0, HSC R-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC R/W-0, HSC
IPL2
(2,3)
IPL1
(2,3)
IPL0
(2,3)
RA
(1)
N
(1)
OV
(1)
Z
(1)
C
(1)
bit 7 bit 0
Legend: HSC = Hardware Settable/Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-9 Unimplemented: Read as ‘0’
bit 7-5 IPL<2:0>: CPU Interrupt Priority Level Status bits
(2,3)
111 = CPU interrupt priority level is 7 (15); user interrupts disabled
110 = CPU interrupt priority level is 6 (14)
101 = CPU interrupt priority level is 5 (13)
100 = CPU interrupt priority level is 4 (12)
011 = CPU interrupt priority level is 3 (11)
010 = CPU interrupt priority level is 2 (10)
001 = CPU interrupt priority level is 1 (9)
000 = CPU interrupt priority level is 0 (8)
Note 1: See Register 3-1 for the description of these bits, which are not dedicated to interrupt control functions.
2: The IPL bits are concatenated with the IPL3 bit (CORCON<3>) to form the CPU interrupt priority level.
The value in parentheses indicates the interrupt priority level if IPL3 = 1.
3: The IPL Status bits are read-only when NSTDIS (INTCON1<15>) = 1.
Note: Bit 8 and bits 4 through 0 are described in Section 3.0 “CPU”.