MSP430F23X_14 Datasheet, PDF (21/93 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

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MSP430F23x
MSP430F24x(1)
MSP430F2410
SLAS547I – JUNE 2007 – REVISED DECEMBER 2012
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 (SLAU144).
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, an internal digitally-controlled oscillator (DCO), and
a high-frequency crystal oscillator. 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 from a 32768-Hz watch crystal, a high-frequency crystal, or the internal very-
low-power 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.
Calibration Data Stored in Information Memory Segment A
Calibration data is stored for the DCO and for the ADC12. It is organized in a tag-length-value (TLV) structure.
NAME
TAG_DCO_30
TAG_ADC12_1
TAG_EMPTY
Table 14. Tags Used by the ADC Calibration Tags
ADDRESS
0x10F6
0x10DA
-
VALUE
0x01
0x10
0xFE
DESCRIPTION
DCO frequency calibration at V_CC = 3 V andT_A = 25°C at calibration
ADC12_1 calibration tag
Identifier for empty memory areas
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
Table 15. Labels Used by the ADC Calibration Tags
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+ = 1.0 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_ADC12CLK = 5 MHz
External Vref = 1.5 V, f_ADC12CLK = 5 MHz
-
-
-
-
-
-
-
-
SIZE
word
word
word
word
word
word
word
word
byte
byte
byte
byte
byte
byte
byte
byte
ADDRESS OFFSET
0x000E
0x000C
0x000A
0x0008
0x0006
0x0004
0x0002
0x0000
0x0007
0x0006
0x0005
0x0004
0x0003
0x0002
0x0001
0x0000
Brownout, Supply Voltage Supervisor (SVS)
The brownout circuit is implemented to provide the proper internal reset signal to the device during power on and
power off. The SVS circuitry detects if the supply voltage drops below a user-selectable level and supports both
supply voltage supervision (the device is automatically reset) and supply voltage monitoring (SVM, the device is
not automatically reset).
The CPU begins code execution after the brownout circuit releases the device reset. However, V_CC may not have
ramped to V_CC(min) at that time. The user must ensure that the default DCO settings are not changed until V_CC
reaches V_CC(min). If desired, the SVS circuit can be used to determine when V_CC reaches V_CC(min).
Copyright © 2007–2012, Texas Instruments Incorporated
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