MSP430X20X1 Datasheet, PDF (48/80 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430x20x1, MSP430x20x2, MSP430x20x3
MIXED SIGNAL MICROCONTROLLER
SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
JTAG and Spy-Bi-Wire Interface
PARAMETER
TEST
CONDITIONS
VCC
MIN TYP MAX UNIT
fSBW
tSBW,Low
tSBW,En
Spy-Bi-Wire input frequency
Spy-Bi-Wire low clock pulse length
Spy-Bi-Wire enable time
(TEST high to acceptance of first clock edge, see
Note 1)
2.2 V / 3 V
0
2.2 V / 3 V 0.025
2.2 V/ 3 V
20 MHz
15 us
1 us
tSBW,Ret
fTCK
Spy-Bi-Wire return to normal operation time
TCK input frequency − 4-wire JTAG (see Note 2)
2.2 V/ 3 V
15
2.2 V
0
3V
0
100 us
5 MHz
10 MHz
RInternal
Internal pull-down resistance on TEST
2.2 V/ 3 V
25
60
90 kΩ
NOTES: 1. Tools accessing the Spy-Bi-Wire interface need to wait for the maximum tSBW,En time after pulling the TEST/SBWCLK pin high
before appling the first SBWCLK clock edge.
2. fTCK may be restricted to meet the timing requirements of the module selected.
JTAG Fuse (see Note 1)
PARAMETER
TEST
CONDITIONS
VCC
MIN TYP MAX UNIT
VCC(FB)
Supply voltage during fuse-blow condition
TA = 25°C
2.5
V
VFB
Voltage level on TEST for fuse-blow
6
7V
IFB
Supply current into TEST during fuse blow
100 mA
tFB
Time to blow fuse
1 ms
NOTES: 1. Once the fuse is blown, no further access to the JTAG/Test, Spy-Bi-Wire, and emulation feature is possible and JTAG is switched
to bypass mode.
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