PxMODE | Intel Microcontroller, 80C196NU, 8XC196NP specification

		REGISTERS
		Px_MODE

Px_MODE	Address:	Table C-11
x = 1–4	Reset State:

Each bit of the port x mode (Px_MODE) register controls whether the corresponding pin functions as a standard I/O port pin or as a special-function signal.

x = 1–3

x = 4

PIN7	PIN6	PIN5	PIN4

—	—	—	—

PIN3	PIN2	PIN1	PIN0
			0

PIN3	PIN2	PIN1	PIN0

Bit	Bit		Function
Number	Mnemonic		Function
Number	Mnemonic

7:0	PIN7:0	Port x Pin y Mode
		This bit determines the mode of the corresponding port pin:
		0	= standard I/O port pin
		1	= special-function signal
		Table C-12 lists the special-function signals for each pin.

Table C-11. Px_MODE Addresses and Reset Values

Register	Address	Reset Value

P1_MODE	1FD0H	00H

P2_MODE	1FD1H	80H

P3_MODE	1FD8H	01H

P4_MODE	1FD9H	00H

Table C-12. Special-function Signals for Ports 1–4

Port 1

Special-

Pin function Signal

P1.0 EPA0

P1.1 EPA1

P1.2 EPA2

P1.3 EPA3

P1.4 T1CLK

P1.5 T1DIR

P1.6 T2CLK

P1.7 T2DIR

Port 2

Special-

Pin function Signal

P2.0 TXD

P2.1 RXD

P2.2 EXTINT0

P2.3 BREQ#

P2.4 EXTINT1

P2.5 HOLD#

P2.6 HLDA#

P2.7 CLKOUT

Port 3

Special-

Pin function Signal

P3.0 CS0#

P3.1 CS1#

P3.2 CS2#

P3.3 CS3#

P3.4 CS4#

P3.5 CS5#

P3.6 EXTINT2

P3.7 EXTINT3

	Port 4

	Special-
Pin	function
	Signal

P4.0	PWM0

P4.1	PWM1

P4.2	PWM2

P4.3	—

C-31

Microcontroller, 80C196NU, 8XC196NP specifications

The Intel 8XC196NP and 80C196NU microcontrollers are part of Intel's renowned 16-bit microcontroller series that gained popularity in the 1980s and 1990s for embedded systems applications. Designed for a variety of applications, these microcontrollers are characterized by their robust performance, versatility, and industry-standard architecture.

The 8XC196NP features an enhanced instruction set with over 100 instructions, allowing for efficient code execution. It operates at clock speeds up to 16 MHz, which contributes to improved performance in time-sensitive applications. The microcontroller is equipped with a 16-bit data bus, enabling more efficient data handling compared to its 8-bit predecessors, thus accommodating complex algorithms and large data sets.

In terms of memory architecture, the 8XC196NP supports an addressable memory space of up to 64 KB of program memory and 64 KB of data memory. This configuration provides sufficient space for large applications while ensuring fast data access. The microcontroller includes integrated features such as timers, serial I/O capabilities, and interrupt processing, which enhance its functionality for real-time applications and control mechanisms.

The 80C196NU, on the other hand, is designed for lower power operation, making it suitable for battery-powered devices. This microcontroller maintains similar features to the 8XC196NP while offering advancements that support low-power consumption. The 80C196NU can also function in a range of temperature environments, making it adaptable for industrial applications.

Both the 8XC196NP and 80C196NU support external memory interfacing, allowing designers to expand the system's capability by connecting additional ROM and RAM. This flexibility makes them appealing for developing complex systems, such as motor controls, industrial automation, and consumer electronics.

Another standout feature of these microcontrollers is their built-in debugging capabilities. Intel provided hardware and software tools that enabled developers to test and troubleshoot their applications effectively, reducing the development time and increasing reliability.

Overall, the Intel 8XC196NP and 80C196NU microcontrollers stand out for their dependability, versatility, and performance, contributing significantly to the evolution of embedded system design. Their legacy continues to influence modern microcontroller technology, ensuring their relevance in a wide array of applications today.

Intel Microcontroller, 80C196NU, 8XC196NP manual Table C-11. PxMODE Addresses and Reset Values

Models: Microcontroller 80C196NU 8XC196NP

Px_MODE

Px_MODE

Address:

Table C-11

PIN7

Bit

Mnemonic

Table C-11. Px_MODE Addresses and Reset Values

Register

P2_MODE

Table C-12. Special-function Signals for Ports 1–4

Pin

Microcontroller, 80C196NU, 8XC196NP specifications