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LM3S6420 Datasheet, PDF (522/565 Pages) Texas Instruments – Stellaris® LM3S6420 Microcontroller | |||
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Electrical Characteristics
17.1.7
17.2
17.2.1
Table 17-6. Flash Memory Characteristics (continued)
Parameter Parameter Name
Min
TRET
Data retention at average operating
10
temperature of 85ËC
TPROG
Word program time
20
TERASE
Page erase time
20
TME
Mass erase time
-
a. A program/erase cycle is defined as switching the bits from 1-> 0 -> 1.
Ethernet Controller
Nom
Max
-
-
-
-
-
-
-
250
Unit
years
µs
ms
ms
Table 17-7. Ethernet Controller DC Characteristics
Parameter
REBIAS
Parameter Name
Value of the pull-down resistor on the ERBIAS pin
Value
12.4K ± 1 %
Unit
â¦
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 17-1. Load Conditions
pin
CL = 50 pF
GND
17.2.2
Clocks
Table 17-8. Phase Locked Loop (PLL) Characteristics
Parameter Parameter Name
Min
Nom
Max
Unit
fref_crystal
Crystal referencea
3.579545
-
8.192
MHz
fref_ext
fpll
External clock referencea
PLL frequencyb
3.579545
-
-
400
8.192
-
MHz
MHz
TREADY
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.
b. PLL frequency is automatically calculated by the hardware based on the XTAL field of the RCC register.
Table 17-9 on page 523 shows the actual frequency of the PLL based on the crystal frequency used
(defined by the XTAL field in the RCC register).
522
June 18, 2012
Texas Instruments-Production Data
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