LM3S610_06 Datasheet, PDF (380/396 Pages) List of Unclassifed Manufacturers – Microcontroller

Electrical Characteristics
19.2
19.2.1
AC Characteristics
Load Conditions
Unless otherwise specified, the following conditions are true for all timing measurements. Timing
measurements are for 4-mA drive strength.
Figure 19-1. Load Conditions
pin
C_L = 50 pF
GND
19.2.2 Clocks
Table 19-6. Phase Locked Loop (PLL) Characteristics
Parameter
Parameter Name
Min
Nom
Max
Unit
f_{REF_CRYSTAL}
f_{REF_EXT}
f_PLL
Crystal reference^a
3.579545
-
External clock reference^a 3.579545
-
PLL frequency^b
-
200
8.192
8.192
-
MHz
MHz
MHz
T_READY
PLL lock time
-
-
0.5
ms
a. The exact value is determined by the crystal value programmed into the XTAL field of the Run-Mode Clock
Configuration (RCC) register (see page 79).
b. PLL frequency is automatically calculated by the hardware based on the XTAL field of the RCC register.
Table 19-7. Clock Characteristics
Parameter
Parameter Name
Min
Nom
Max
Unit
f_IOSC
Internal oscillator
frequency
7
15
22
MHz
f_MOSC
Main oscillator frequency
1
t_{MOSC_PER}
Main oscillator period
125
f_{REF_CRYSTAL_BYPASS} Crystal reference using the
1
main oscillator (PLL in
BYPASS mode)^a
-
8
MHz
-
1000
ns
-
8
MHz
f_{REF_EXT_BYPASS}
External clock reference
0
(PLL in BYPASS mode)^a
-
50
MHz
f_{SYSTEM_CLOCK}
System clock
0
-
50
a. The ADC module cannot be used when the PLL is in Bypass mode (BYPASS set to 1 in the RCC register).
MHz
380
October 8, 2006
Preliminary