Texas Instruments MSP430x11x1 warranty Port P2, unbonded bits P2.6 and P2.7, JTAG fuse check mode

MSP430x11x1

MIXED SIGNAL MICROCONTROLLER

SLAS241C ± SEPTEMBER 1999 ± REVISED JUNE 2000

APPLICATION INFORMATION

Port P2, unbonded bits P2.6 and P2.7

P2SEL.x

P2DIR.x

Direction Control From Module

P2OUT.x

Module X OUT

P2IN.x

Module X IN

P2IRQ.x

0	0:	Input
	1:	Output

1

0

1

Node Is Reset With PUC

EN

Bus Keeper

D

P2IE.x	EN	Interrupt	PUC
		Edge
P2IFG.x	Q
	Set	Select
	Interrupt	P2IES.x
	Flag
		P2SEL.x

NOTE: x = Bit/identifier, 6 to 7 for port P2 without external pins
		Direction
P2Sel.x	P2DIR.x	control from	P2OUT.x	Module X OUT	P2IN.x	Module X IN	P2IE.x	P2IFG.x	P2IES.x
		module
P2Sel.6	P2DIR.6	P2DIR.6	P2OUT.6	VSS	P2IN.6	unused	P2IE.6	P2IFG.6	P2IES.6
P2Sel.7	P2DIR.7	P2DIR.7	P2OUT.7	VSS	P2IN.7	unused	P2IE.7	P2IFG.7	P2IES.7

NOTE: A good use of the unbonded bits 6 and 7 of port P2 is to use the interrupt flags. The interrupt flags can not be influenced from any signal other than from software. They work then as a soft interrupt.

JTAG fuse check mode

MSP430 devices that have the fuse on the TEST terminal have a fuse check mode that tests the continuity of the fuse the first time the JTAG port is accessed after a power-on reset (POR). When activated, a fuse check current can flow from the TEST pin to ground if the fuse is not burned. Care must be taken to avoid accidentally activating the fuse check mode and increasing overall system power consumption.

When the TEST pin is taken back low after a test or programming session, the fuse check mode and sense currents are terminated.

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