PIC24HJ32GP202-I/SO Microchip Technology Inc., PIC24HJ32GP202-I/SO Datasheet - Page 59

• Manufacturer Part Number: PIC24HJ32GP202-I/SO
• Description: 16-BIT MCU, 28LD, 32KB FLASH, 40 MIPS, NANOWATT
• Manufacturer: Microchip Technology Inc.

Specifications of PIC24HJ32GP202-I/SO

• A/d Inputs: 10 Channel, 12-Bit
• Cpu Speed: 40 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 21
• Interface: I2C/SPI/UART
• Memory Type: Flash
• Number Of Bits: 16
• Package Type: 28-pin SOIC
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Timers: 3-16-bit, 1-32-bit
• Voltage, Range: 3-3.6 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

6.3
PIC24HJ32GP202/204
devices implement a total of 17 registers for the inter-
rupt controller:
• Interrupt Control Register 1 (INTCON1)
• Interrupt Control Register 2 (INTCON2)
• Interrupt Flag Status Registers (IFSx)
• Interrupt Enable Control Registers (IECx)
• Interrupt Priority Control Registers (IPCx)
• Interrupt Control and Status Register (INTTREG)
6.3.1
Global interrupt control functions are controlled from
INTCON1 and INTCON2. INTCON1 contains the
Interrupt Nesting Disable (NSTDIS) bit as well as the
control and status flags for the processor trap sources.
The INTCON2 register controls the external interrupt
request signal behavior and the use of the Alternate
Interrupt Vector Table.
6.3.2
The IFS registers maintain all the interrupt request
flags. Each source of interrupt has a status bit, which is
set by the respective peripherals or external signal and
this is cleared via software.
6.3.3
The IEC registers maintain all the interrupt enable bits.
These control bits are used individually to enable inter-
rupts from the peripherals or external signals.
© 2007 Microchip Technology Inc.
Interrupt Control and Status
Registers
INTCON1 AND INTCON2
IFSx
IECx
PIC24HJ32GP202/204 and PIC24HJ16GP304
and
PIC24HJ16GP304
Preliminary
6.3.4
The IPC registers are used to set the interrupt priority
level for each source of interrupt. Each user interrupt
source can be assigned to one of the eight priority lev-
els.
6.3.5
The INTTREG register contains the associated
interrupt vector number and the new CPU interrupt
priority level, which are latched into vector number
(VECNUM<6:0>) and Interrupt level (ILR<3:0>) bit
fields in the INTTREG register. The new interrupt
priority level is the priority of the pending interrupt.
The interrupt sources are assigned to the IFSx, IECx
and IPCx registers in the same sequence that they are
listed in Table 6-1. For example, the INT0 (External
Interrupt 0) is shown as having vector number 8 and a
natural order priority of 0. Thus, the INT0IF bit is found
in IFS0<0>, the INT0IE bit in IEC0<0>, and the INT0IP
bits in the first position of IPC0 (IPC0<2:0>).
6.3.6
Although these are not specifically part of the interrupt
control hardware, two of the CPU Control registers
contain bits that control interrupt functionality:
• The CPU STATUS register, SR, contains the
• The CORCON register contains the IPL3 bit
All Interrupt registers are described in Register 6-1
through Register 6-19 in the following pages.
IPL<2:0> bits (SR<7:5>). These bits indicate the
current CPU interrupt priority level. The user can
change the current CPU priority level by writing to
the IPL bits.
which, together with IPL<2:0>, also indicates the
current CPU priority level. IPL3 is a read-only bit,
so that trap events cannot be masked by the user
software.
IPCx
INTTREG
STATUS REGISTERS
DS70289A-page 57