MSP430F249-EP_014 Datasheet, PDF (35/81 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F249-EP
MIXED SIGNAL MICROCONTROLLER
2008
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
main DCO characteristics
D All ranges selected by RSELx overlap with RSELx + 1: RSELx = 0 overlaps RSELx = 1, ... RSELx = 14
overlaps RSELx = 15.
D DCO control bits DCOx have a step size as defined by parameter S_DCO.
D Modulation control bits MODx select how often f_{DCO(RSEL,DCO+1)} is used within the period of 32 DCOCLK
cycles. The frequency f_{DCO(RSEL,DCO)} is used for the remaining cycles. The frequency is an average equal
to:
f_average + _MOD
32
f_{DCO(RSEL,DCO)}
f_{DCO(RSEL,DCO)1)}
f_{DCO(RSEL,DCO)})(32*MOD) f_{DCO(RSEL,DCO)1)}
DCO frequency
Vcc
f_DCO(0,0)
f_DCO(0,3)
f_DCO(1,3)
f_DCO(2,3)
f_DCO(3,3)
f_DCO(4,3)
f_DCO(5,3)
f_DCO(6,3)
f_DCO(7,3)
f_DCO(8,3)
f_DCO(9,3)
f_DCO(10,3)
f_DCO(11,3)
f_DCO(12,3)
f_DCO(13,3)
f_DCO(14,3)
f_DCO(15,3)
f_DCO(15,7)
S_RSEL
PARAMETER
Supply voltage range
DCO frequency (0, 0)
DCO frequency (0, 3)
DCO frequency (1, 3)
DCO frequency (2, 3)
DCO frequency (3, 3)
DCO frequency (4, 3)
DCO frequency (5, 3)
DCO frequency (6, 3)
DCO frequency (7, 3)
DCO frequency (8, 3)
DCO frequency (9, 3)
DCO frequency (10, 3)
DCO frequency (11, 3)
DCO frequency (12, 3)
DCO frequency (13, 3)
DCO frequency (14, 3)
DCO frequency (15, 3)
DCO frequency (15, 7)
Frequency step between
range RSEL and RSEL+1
TEST CONDITIONS
RSELx < 14
RSELx = 14
RSELx = 15
RSELx = 0, DCOx = 0, MODx = 0
RSELx = 0, DCOx = 3, MODx = 0
RSELx = 1, DCOx = 3, MODx = 0
RSELx = 2, DCOx = 3, MODx = 0
RSELx = 3, DCOx = 3, MODx = 0
RSELx = 4, DCOx = 3, MODx = 0
RSELx = 5, DCOx = 3, MODx = 0
RSELx = 6, DCOx = 3, MODx = 0
RSELx = 7, DCOx = 3, MODx = 0
RSELx = 8, DCOx = 3, MODx = 0
RSELx = 9, DCOx = 3, MODx = 0
RSELx = 10, DCOx = 3, MODx = 0
RSELx = 11, DCOx = 3, MODx = 0
RSELx = 12, DCOx = 3, MODx = 0
RSELx = 13, DCOx = 3, MODx = 0
RSELx = 14, DCOx = 3, MODx = 0
RSELx = 15, DCOx = 3, MODx = 0
RSELx = 15, DCOx = 7, MODx = 0
S_RSEL = f_{DCO(RSEL+1,DCO)}/f_{DCO(RSEL,DCO)}
VCC
MIN
1.8
2.2
3
2.2 V/3 V 0.06
2.2 V/3 V 0.07
2.2 V/3 V 0.10
2.2 V/3 V 0.14
2.2 V/3 V 0.20
2.2 V/3 V 0.28
2.2 V/3 V 0.39
2.2 V/3 V 0.54
2.2 V/3 V 0.80
2.2 V/3 V 1.10
2.2 V/3 V 1.60
2.2 V/3 V 2.50
2.2 V/3 V
3
2.2 V/3 V 4.30
2.2 V/3 V
6
2.2 V/3 V 8.60
3V
12
3V
16
2.2 V/3 V 1.35
S_DCO
Frequency step between
tap DCO and DCO+1
S_DCO = f_{DCO(RSEL,DCO+1)}/f_{DCO(RSEL,DCO)}
2.2 V/3 V 1.07
Duty cycle
Measured at P1.4/SMCLK
2.2 V/3 V
40
TYP MAX UNIT
3.60
3.60 V
3.60
0.14 MHz
0.17 MHz
0.20 MHz
0.28 MHz
0.40 MHz
0.54 MHz
0.77 MHz
1.06 MHz
1.50 MHz
2.10 MHz
3 MHz
4.30 MHz
5.50 MHz
7.30 MHz
9.60 MHz
13.90 MHz
18.50 MHz
26 MHz
1.55
2 ratio
1.08 1.16 ratio
50
60 %
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