MSP430G2x52
MSP430G2x12
SLAS722B
–
DECEMBER 2010
–
REVISED MARCH 2011
Peripherals
Peripherals are connected to the CPU through data, address, and control buses and can be handled using all
instructions. For complete module descriptions, see the
MSP430x2xx Family User's Guide
Oscillator and System Clock
The clock system is supported by the basic clock module that includes support for a 32768-Hz watch crystal
oscillator, an internal very-low-power low-frequency oscillator and an internal digitally controlled oscillator (DCO).
The basic clock module is designed to meet the requirements of both low system cost and low power
consumption. The internal DCO provides a fast turn-on clock source and stabilizes in less than 1
µs.
The basic
clock module provides the following clock signals:
•
Auxiliary clock (ACLK), sourced either from a 32768-Hz watch crystal or the internal LF oscillator.
•
Main clock (MCLK), the system clock used by the CPU.
•
Sub-Main clock (SMCLK), the sub-system clock used by the peripheral modules.
The DCO settings to calibrate the DCO output frequency are stored in the information memory segment A.
Calibration Data Stored in Information Memory Segment A
Calibration data is stored for both the DCO and for ADC10 organized in a tag-length-value structure.
Table 9. Tags Used by the ADC Calibration Tags
NAME
TAG_DCO_30
TAG_ADC10_1
TAG_EMPTY
ADDRESS
0x10F6
0x10DA
-
VALUE
0x01
0x08
0xFE
ADC10_1 calibration tag
Identifier for empty memory areas
DESCRIPTION
DCO frequency calibration at V
CC
= 3 V and T
A
= 30°C at calibration
Table 10. Labels Used by the ADC Calibration Tags
LABEL
CAL_ADC_25T85
CAL_ADC_25T30
CAL_ADC_25VREF_FACTOR
CAL_ADC_15T85
CAL_ADC_15T30
CAL_ADC_15VREF_FACTOR
CAL_ADC_OFFSET
CAL_ADC_GAIN_FACTOR
CAL_BC1_1MHz
CAL_DCO_1MHz
CAL_BC1_8MHz
CAL_DCO_8MHz
CAL_BC1_12MHz
CAL_DCO_12MHz
CAL_BC1_16MHz
CAL_DCO_16MHz
CONDITION AT CALIBRATION / DESCRIPTION
INCHx = 0x1010, REF2_5 = 1, T
A
= 85°C
INCHx = 0x1010, REF2_5 = 1, T
A
= 30°C
REF2_5 = 1, T
A
= 30°C, I
(VREF+)
= 1 mA
INCHx = 0x1010, REF2_5 = 0, T
A
= 85°C
INCHx = 0x1010, REF2_5 = 0, T
A
= 30°C
REF2_5 = 0, T
A
= 30°C, I
(VREF+)
= 0.5 mA
External VREF = 1.5 V, f
(ADC10CLK)
= 5 MHz
External VREF = 1.5 V, f
(ADC10CLK)
= 5 MHz
-
-
-
-
-
-
-
-
SIZE
word
word
word
word
word
word
word
word
byte
byte
byte
byte
byte
byte
byte
byte
ADDRESS
OFFSET
0x0010
0x000E
0x000C
0x000A
0x0008
0x0006
0x0004
0x0002
0x0009
0x00008
0x0007
0x0006
0x0005
0x0004
0x0003
0x0002
12
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©
2010–2011, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
