MRF24J40MB-I Datasheet, PDF (127/156 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
3.16 MAC Timer
Many features of the IEEE 802.15.4-2003 Standard are
based on a symbol period of 16 μs. A 16-bit MAC timer
is provided to generate interrupts configurable in
multiples of 8 μs. The MAC timer begins counting down
when a value is written to the HSYMTMRH (0x29) reg-
ister. A HSYMTMRIF (0x31<5>) interrupt is generated
when the count reaches zero.
TABLE 3-22: REGISTERS ASSOCIATED WITH THE MAC TIMER
Addr. Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0x28 HSYMTMRL HSYMTMR7 HSYMTMR6 HSYMTMR5 HSYMTMR4 HSYMTMR3 HSYMTMR2 HSYMTMR1 HSYMTMR0
0x29 HSYMTMRH HSYMTMR15 HSYMTMR14 HSYMTMR13 HSYMTMR12 HSYMTMR11 HSYMTMR10 HSYMTMR9 HSYMTMR8
0x31 INSTAT
SLPIF
WAKEIF HSYMTMRIF SECIF
RXIF
TXG2IF
TXG1IF
TXNIF
0x32 INTCON
SLPIE
WAKEIE HSYMTMRIE SECIE
RXIE
TXG2IE
TXG1IE
TXNIE
© 2010 Microchip Technology Inc.
Preliminary
DS39776C-page 127