CC2510FX Datasheet, PDF (111/253 Pages) List of Unclassifed Manufacturers – True System-on-Chip with Low Power RF Transceiver and 8051 MCU

CC2510Fx / CC2511Fx
13.4 MAC Timer (Timer 2)
The MAC timer is designed for slot timing
operations for MAC layers of RF protocols.
The timer includes a highly tunable
prescaler allowing the user to select a
timer tick interval that equals, or is an
integer fraction of a transmission slot.
• 8-bit timer
• 18-bit tunable prescaler
13.4.1 Timer Operation
This section describes the operation of the
timer.
The timer count can be read from the
T2CT SFR register. The timer decrements
by 1 at each timer tick. When the timer
count reaches 0x00 the timer expires and
does not wrap around. When the timer
expires, the register bit T2CTL.TEX is set
to 1. An interrupt request is generated
when the timer expires, if the interrupt
mask T2CTL.INT is 1.
When a new value is written to the timer
count register, T2CT, then this value is
stored in the counter immediately. If a tick
and a write to T2CT occurs at the same
time, the written value will be decremented
before it is stored.
The timer tick period T, is given as:
T = T2PR * Val(T2CTL.TIP) clock cycles.
where the function Val(x) is set by the tick
period, T2CTL.TIP and defined as
Val(00)=64
Val(01)=128
Val(10)=256
Val(11)=1024
The tick generator can be set to run freely
or to run only when the timer holds a non-
zero value. Whenever the tick generator is
started it starts from its zero state. At this
point there will be T2PR*Val(T2CTL.TIP)-1
clock cycles until the next tick.
13.4.2 Timer 2 Registers
The SFR registers associated with Timer 2
are listed in this section. These registers
are the following:
• T2CTL – Timer 2 Control
• T2PRE – Timer 2 Prescaler
• T2CT – Timer 2 Count
CC2510Fx/CC2511Fx PRELIMINARY Data Sheet (Rev. 1.2) SWRS055A Page 111 of
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