MSP430G2231-EP_16 Datasheet, PDF (22/46 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430G2231-EP
SLAS862 – JUNE 2012
www.ti.com
Main DCO Characteristics
• All ranges selected by RSELx overlap with RSELx + 1: RSELx = 0 overlaps RSELx = 1, ... RSELx = 14
overlaps RSELx = 15.
• DCO control bits DCOx have a step size as defined by parameter S_DCO.
• 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
=
32 × f_{DCO(RSEL,DCO)} × f_{DCO(RSEL,DCO+1)}
MOD × f_{DCO(RSEL,DCO)} + (32 – MOD) × f_{DCO(RSEL,DCO+1)}
DCO Frequency
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
RSELx < 14
V_CC
MIN TYP
1.8
V_CC
Supply voltage
RSELx = 14
2.2
RSELx = 15
3
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
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
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)}
3V
0.096
3V
0.12
3V
0.15
3V
0.21
3V
0.30
3V
0.41
3V
0.58
3V
0.80
3V
0.8
3V
1.6
3V
2.3
3V
3.4
3V
4.25
3V
4.3
3V
7.8
3V
8.6
3V
15.25
3V
21
3V
1.35
S_DCO
Frequency step between
tap DCO and DCO+1
S_DCO = f_{DCO(RSEL,DCO+1)}/f_{DCO(RSEL,DCO)}
3V
1.08
Duty cycle
Measured at SMCLK output
3V
50
MAX
3.6
3.6
3.6
1.5
7.3
13.9
UNIT
V
V
V
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
ratio
ratio
%
22
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