Intel 87C196CB, 8XC196NT user manual Prog#, Rxd

SIGNAL DESCRIPTIONS

		Table A-3. Signal Descriptions (Continued)
Name	Type	Description
PROG#	I	Programming Start
		During programming, a falling edge latches data on the PBUS and begins
		programming, while a rising edge ends programming. The current location is
		programmed with the same data as long as PROG# remains asserted, so the
		data on the PBUS must remain stable while PROG# is active.
		During a word dump, a falling edge causes the contents of an OTPROM
		location to be output on the PBUS, while a rising edge ends the data transfer.
		PROG# is multiplexed with P2.2 and EXTINT.
PVER	O	Program Verification
		During slave or auto programming, PVER is updated after each programming
		pulse. A high output signal indicates successful programming of a location,
		while a low signal indicates a detected error.
		PVER is multiplexed with P2.0 and TXD.
RD#	O	Read
		Read-signal output to external memory. RD# is asserted only during external
		memory reads.
		RD# is multiplexed with P5.3 and SLPRD#.
READY	I	Ready Input
		This active-high input signal is used to lengthen external memory cycles for
		slow memory by generating wait states in addition to the wait states that are
		generated internally.
		When READY is high, CPU operation continues in a normal manner with wait
		states inserted as programmed in the chip configuration registers . READY is
		ignored for all internal memory accesses.
		READY is multiplexed with P5.6.
RESET#	I/O	Reset
		A level-sensitive reset input to and open-drain system reset output from the
		microcontroller. Either a falling edge on RESET# or an internal reset turns on a
		pull-down transistor connected to the RESET# pin for 16 state times. In the
		powerdown and idle modes, asserting RESET# causes the chip to reset and
		return to normal operating mode. After a device reset, the first instruction fetch
		is from FF2080H.
RXCAN	I	Receive
		This signal carries messages from other nodes on the CAN bus to the
		integrated CAN controller.
RXD	I/O	Receive Serial Data
		In modes 1, 2, and 3, RXD receives serial port input data. In mode 0, it
		functions as either an input or an open-drain output for data.
		RXD is multiplexed with P2.1 and PALE#.
SC1:0	I/O	Clock Pins for SSIO0 and 1
		For handshaking mode, configure SC1:0 as open-drain outputs.
		This pin carries a signal only during receptions and transmissions. When the
		SSIO port is idle, the pin remains either high (with handshaking) or low (without
		handshaking).
		SC0 is multiplexed with P6.4, and SC1 is multiplexed with P6.6.

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