IBM EM78M611E manual Pin Description, Symbol Function

EM78M611E

Universal Serial Bus Series Microcontroller

6		Pin Description
		Symbol	I/O	Function
		P50 ~ P57	I/O	General 8-bit bidirectional input/output port. All pins on this port can be
				internally pulled-high by software control.
		P60 ~ P67	I/O	General 8-bit bidirectional input/output port. All pins on this port can be
				internally pulled-high by software control.
		P70 ~ P72		LED sink pins
			I/O	P76 ~ P77 will have an internally pulled-high resistor when the EM78M611E is
		P76 ~ P77
				running in PS/2 mode.
		P80 ~ P87	I/O	General 8-bit bidirectional input/output port. All pins on this port can be
				internally pulled-high by software control.
		P90 ~ P93	I/O	General 6-bit bidirectional input/output port. All pins on this port can be
		P95 ~ P96		internally pulled-high by software control or LED sink pins.
		P94 / Vpp	I	Input only. MTP program pin.
		PWM1	O	PWM output pins.
		PWM2
				USB plus data line interface or CLK for PS/2 keyboard.
	D+/CLK/P74		I/O	When the EM78M611E is running in PS/2 mode, this pin will have an internal
				pulled-high resistor (2.2KΩ), with VDD=5.0V.
				USB minus data line interface or DATA for PS/2 keyboard.
				When the EM78M611E is running in PS/2 mode, this pin will have an internal
	D-/DATA/P75		I/O	pulled-high resistor (2.2KΩ), with V3.3=3.3V.
				When the EM78M611E is running in USB mode, this pin will have an internal
				pulled-high resistor (1.5KΩ), with VDD=3.3V.
		OSCI	I	6MHz / 12MHz ceramic resonator input.
		OSCO	O	Return path for 6MHz / 12MHz ceramic resonator.
		VNN	−	MTP program pin. Used in programming the on-chip ROM. During normal
				operation, this pin is connected to Ground.
		V3.3	PWR	3.3V regulator output
		VDD	PWR	Power supply pin
		GND	PWR	Ground pin

6 • Product Specification (V1.1) 11.22.2006

(This specification is subject to change without further notice)