Timer 2 Registers - Texas Instruments CC253x User Manual

Timer 2 Registers

Calculation of New Timer Value and Overflow Count Value
N = Current Sleep Timer value
c
N = Stored Sleep Timer value
ST
K = Clock ratio = 976.5625
ck
stw = Sleep Timer width = 24
P = Timer 2 period
T
P = Overflow period
OVF
O = Stored overflow-count value
ST
O = Overflow ticks while sleeping
TICK
t = Stored timer value
ST
T = Overhead = 86
OH
N = N – N
t c ST
stw
N ≤ 0 → N = 2
t d
C = N × K + T
d ck ST
T = C mod P
T
Timer2Value = T
( )
C T
-
O =
TICK
P
T
O = (O + O ) mod P
TICK ST
Timer2OverflowCount = O
(1)
Clock ratio of Timer 2 clock frequency (32 MHz) and Sleep Timer clock frequency (32 kHz)
For a given Timer 2 period value, P
start for which the timer value is correctly updated after starting. The maximum value is given in terms of
the number of Sleep Timer clock periods, that is, 32-kHz clock periods, t
24
(2
t
£
ST(max)
22.5 Timer 2 Registers
The SFR registers associated with Timer 2 are listed in this section. These registers are the following:
• T2MSEL
• T2M1
• T2M0
• T2MOVF2
• T2MOVF1
• T2MOVF0
• T2IRQF
• T2IRQM
• T2EVTCFG – Timer 2 event output configuration
• T2CTRL
202
Timer 2 (MAC Timer)
(1)
+ N ; N > 0 → N = N
t t d t
+ T (rounded to nearest integer value)
OH
OVF
, there is a maximum duration between Timer 2 synchronous stop and
T
1) P T
- ´ +
T OH
K
ck
– Timer 2 multiplexed register control
– Timer 2 multiplexed count high
– Timer 2 multiplexed count low
– Timer 2 multiplexed overflow count 2
– Timer 2 multiplexed overflow count 1
– Timer 2 multiplexed overflow count 0
– Timer 2 interrupt flags
– Timer 2 interrupt masks
– Timer 2 configuration
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.
ST(max)
SWRU191F – April 2009 – Revised April 2014
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