MC13224VR2 Datasheet, PDF (38/48 Pages) Freescale Semiconductor, Inc – Advanced ZigBee™- Compliant Platform-in-Package (PiP) for the 2.4 GHz IEEE® 802.15.4 Standard

6.8
Internal Low Speed Reference Oscillator Specifications
Table 13. Internal 2 KHz Oscillator Specifications
Characteristic
Symbol
Min
Typ
Max Unit
Oscillator frequency tolerance over temperature
Frequency tolerance @ 25 °C
Frequency accuracy after calibration
Temperature coefficient
Supply voltage coefficient
Initial calibration time
2
-
KHz
-
-
KHz
-
%
-
%/°C
-
%/V
-
ms
6.9 Control Timing and CPU Bus Specifications
Table 14. MCU Control Timing
(VBATT, LREG_BK_FB = 3.3 V, T_A = 25 °C, f_ref = 24 MHz, unless otherwise noted.)
Parameter
Symbol
Min
Typical
Max
Unit
CPU Bus frequency (t_cyc = 1/f_Bus)
CPU Bus frequency with active TX or RX
f_Bus
f_ref/64 ¹
—
2
f_ref ¹
MHz
MHz
Real-time interrupt internal oscillator frequency
External reset pulse width²
2
KHz
-
4
—
osc clks
External minimum interrupt pulse width (KBI[7:4])
-
-
—
ns
1 _{Normal operation uses a 24 MHz reference. The MC13224V allows up to a 26 MHz max reference oscillator.}
2 _{This is the shortest pulse that is guaranteed to be recognized as a reset pin request. There always must be 3 clocks of the}
operating oscillator; this can vary from the low power oscillators to the reference oscillator.
6.9.1 Timer Module Input Characteristics
Four-bit synchronizer circuits determine the shortest input pulses that can be recognized or the fastest
clock that can be used as the optional external source to the timer counter. These synchronizers operate
from the peripheral clock rate. Table 15 shows timer input timing values.
Table 15. Timer Input Timing
(VBATT, LREG_BK_FB = 3.3 V, TA = 25 °C, fref = 24 MHz, unless otherwise noted.)
Parameter
External clock frequency
External clock period
Input capture pulse width
Symbol
Min
dc
>3
TBD
Max
peripheral_bus_clk/3
—
—
Unit
MHz
t_cyc
t_cyc
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