MRF24XA_15 Datasheet, PDF (20/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
REGISTER 2-3:
R/HS-1
VREGIF
bit 7
PIR1 (PERIPHERAL INTERRUPT REGISTER 1)
R-0
R/HS-0
R/W/HC-0
R-0
R/W/HS-0
r
RDYIF
IDLEIF
r
CALSOIF
Address: 0x04
R/W/HS-0
R-0
CALHAIF
r
bit 0
Legend: R = Readable bit
-n = Value at POR
r = Reserved
W = Writable bit
‘1’ = Bit is set
HC = Hardware Clear
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
HS = Hardware Set
bit 7
VREGIF: Voltage Regulator On Interrupt Flag bit
This is a nonpersistent bit. The register bit initializes to one on 1.2V reset except for PINRESET and
only clears when reading PIR1. Note that the corresponding IE bit is not implemented⁽¹⁾.
bit 6
Reserved: Maintain as ‘0’
bit 5
RDYIF: Ready State Interrupt Flag bit
Set each time when ready state is reached:
• when Calibration ended (CALST = 0)
• when initialization ended (INITDONESF = 1)
• when crystal is ramped up (XTALSF = 1)
This bit is cleared when PIR1 is read.
bit 4
IDLEIF: Idle State Interrupt Flag bit
Set each time the IDLESF is set and if MCU did not trigger this change. This is unchanged when MCU
aborts an action by clearing either of TXST, TXENC, RXDEC or EDST bits. This bit is cleared when
PIR1 is read.
bit 3
Reserved: Maintain as ‘0’
bit 2
CALSOIF: Calibration Soft Interrupt Flag bit
CALSOIF = 1 indicates that Calibration is needed (CALST) although the radio is still functional. It also
warns of a possible degradation in signal quality and consumption, and a risk of
CALHAIF interrupt. This bit is cleared when PIR1 is read.
bit 1
CALHAIF: Calibration Hard Interrupt Flag bit
CALHAIF = 1 indicates that immediate Calibration (CALST) is mandatory, otherwise the radio is not
functional. The device enters into malfunction state. This bit is cleared when PIR1 is
read.
bit 0
Reserved: Maintain as ‘0’
Note 1: Generated non-maskable interrupt is gated off until the 1.2V reset is released.
DS70005023C-page 20
Preliminary
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