MRF24XA_15 Datasheet, PDF (87/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
TABLE 3-3: REGISTERS ASSOCIATED WITH GPIO FUNCTIONALITIES
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PIR4
TXSFDIF
RXSFDIF
PIE4
TXSFDIE
RXSFDIE
GPIO
GPIOEN TRISGPIO2
STGPIO
r
GPIO2P
PULLGPIO
r
PULLDIRGPIO2
PINCON
r
GIE
Legend: r = Reserved, read as ‘0’.
ERRORIF
ERRORIE
TRISGPIO1
GPIO1P
PULLDIRGPIO1
r
WARNIF
WARNIE
TRISGPIO0
GPIO0P
PULLDIRGPIO0
IRQIF
EDCCAIF
EDCCAIE
r
r
r
GPIO2IF
GPIO1IF
GPIO2IE
GPIO1IE
GPIO2
GPIO1
STENGPIO2
STENGPIO1
PULLENGPIO2 PULLENGPIO1
GPIOMODE<3:0>
GPIO0IF
GPIO0IE
GPIO0
STENGPIO0
PULLENGPIO0
3.4 PA and LNA Outputs
MRF24XA has a Power Amplifier (PA) control pin (pin
20) and a Low Noise Amplifier (LNA) control pin (pin
21). These pins are capable of handling external PAs
and LNAs or external antenna switch circuits.
MRF24XA can also tolerate different start-up times of
different external circuits by sending or accepting data
if the external circuits completes their ramp up.
MRF24XA can handle both active-high or active-low
control signal sensitive circuits.
For more information, refer to Section 9.13 “External
Power Amplifier (PA)/Low-Noise Amplifier (LNA)” .
3.5 Battery Monitor
The voltage level on the battery is monitored. If the bat-
tery monitoring is enabled and the voltage level drops
below a threshold, voltage interrupt (WARNIF) is
asserted. Refer to Register 3-18 for more information
on the battery.
REGISTER 3-18:
R-0
r
bit 7
BATMON (BATTERY MONITOR CONFIGURATION REGISTER)
R/W-1
R/W-11111
BATMONPD
BATMON<4:0>
ADDRESS: 0x3F
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
bit 5
bit 4-0
Reserved: Maintain as ‘0’
BATMONPD: Battery Monitor Power-Down bit
If battery monitor is working and battery voltage drops below the threshold by BATMON<4:0> then
WARNIF is set.
1 = Battery monitor is OFF
0 = Battery monitor is working
BATMON<4:0>: Battery Monitor Threshold Field bits
VTHRESHOLD = 3.6 - 0.071 * BATMON<4:0> (V)
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 87