AC164139 Microchip Technology, AC164139 Datasheet - Page 97

• Manufacturer Part Number: AC164139
• Description: Graphics Display Prototype Board Graphics
• Manufacturer: Microchip Technology

Specifications of AC164139

• Main Purpose: LCD Development
• Embedded: No
• Utilized Ic / Part: PICtail™ Plus Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The CORCON register contains the IPL3 bit, which,
together with IPL<2:0>, indicates the current CPU
priority level. IPL3 is a read-only bit so that trap events
cannot be masked by the user software.
The interrupt controller has the Interrupt Controller Test
register, INTTREG, which displays the status of the
interrupt controller. When an interrupt request occurs,
it’s associated vector number and the new interrupt pri-
ority level are latched into INTTREG. This information
can be used to determine a specific interrupt source if
REGISTER 7-1:
 2010 Microchip Technology Inc.
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15-9
bit 7-5
Note 1:
R/W-0, HSC
IPL2
U-0
—
2:
3:
(2,3)
See Register 3-1 for the description of the remaining bits (bit 8, 4, 3, 2, 1 and 0) that are not dedicated to
interrupt control functions.
The IPL bits are concatenated with the IPL3 (CORCON<3>) bit to form the CPU interrupt priority level.
The value in parentheses indicates the interrupt priority level if IPL3 = 1.
The IPL Status bits are read-only when NSTDIS (INTCON1<15>) = 1.
Unimplemented: Read as ‘0’
IPL<2:0>: CPU Interrupt Priority Level Status bits
111 = CPU interrupt priority level is 7 (15); user interrupts are 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)
R/W-0, HSC R/W-0, HSC
IPL1
U-0
—
SR: ALU STATUS REGISTER (IN CPU)
(2,3)
HSC = Hardware Settable/Clearable bit
W = Writable bit
‘1’ = Bit is set
IPL0
U-0
—
(2,3)
R-0, HSC
PIC24FJ256DA210 FAMILY
RA
U-0
—
(1)
U = Unimplemented bit, read as ‘0’
R/W-0, HSC
‘0’ = Bit is cleared
a generic ISR is used for multiple vectors (such as
when ISR remapping is used in bootloader applica-
tions) or to check if another interrupt is pending while in
an ISR.
All interrupt registers are described in Register 7-1
through Register 7-40 in the succeeding pages.
U-0
N
—
(1)
(2,3)
R/W-0, HSC
OV
U-0
—
(1)
x = Bit is unknown
R/W-0, HSC R/W-0, HSC
U-0
Z
—
(1)
DS39969B-page 97
R-0, HSC
DC
C
(1)
(1)
bit 8
bit 0