Texas Instruments manual 1 Pin Descriptions of the MSC1210, Pin # Name Description

							MSC1210 Pin-Out
Table 1−1 Pin Descriptions of the MSC1210 (Continued)
Pin #	Name	Description
34-40, 43	P2.0-P2.7	Port 2 is a bidirectional I/O port. The alternate functions for Port 2 are
		listed below.
		Port 2—Alternate Functions:
34-40, 43	P2.0-P2.7	PORT		ALTERNATE			MODE
		P2.0		A8			Address Bit 8
		P2.1		A9			Address Bit 9
		P2.2		A10			Address Bit 10
		P2.3		A11			Address Bit 11
		P2.4		A12			Address Bit 12
		P2.5		A13			Address Bit 13
		P2.6		A14			Address Bit 14
		P2.7		A15			Address Bit 15
44	PSEN, OSCCLK,	Program Store Enable: Connected to optional external memory as a
	MODCLK	chip enable. PSEN will provide an active low pulse. In programming
		mode, PSEN is used as an input along with ALE to define serial or par-
		allel programming mode. PSEN is held HIGH for parallel programming
		and tied LOW for serial programming. This pin can also be selected
		(when not using external program memory) to output the Oscillator
		clock, Modulator clock, HIGH, or LOW.
		ALE		PSEN			Program Mode Selection
		NC		NC			Normal Operation
		0	1				Parallel Programming
		1	0				Serial Programming
		0	0				Reserved
45	ALE	Address Latch Enable: Used for latching the low byte of the address
		during an access to external memory. ALE is emitted at a constant rate
		of 1/2 the oscillator frequency, and can be used for external timing or
		clocking. One ALE pulse is skipped during each access to external
		data memory. In programming mode, ALE is used as an input along
		with PSEN to define serial or parallel programming mode. ALE is held
		HIGH for serial programming and tied LOW for parallel programming.
48		External Access Enable:				must be externally held LOW to enable
	EA				EA
		the device to fetch code from external program memory locations start-
		ing with 0000H.
46, 47,	P0.0−P0.7	Port 0 is a bidirectional I/O port. The alternate functions for Port 0 are
49-54		listed below.
		Port 0—Alternate Functions:
		PORT		ALTERNATE			MODE
		P0.0		AD0			Address/Data Bit 0
		P0.1		AD1			Address/Data Bit 1
		P0.2		AD2			Address/Data Bit 2
		P0.3		AD3			Address/Data Bit 3
		P0.4		AD4			Address/Data Bit 4

Introduction to the MSC1210 1-5