CCR0, WS1 WS0 Demux BHE#, WS0 WS1 | Intel Microcontroller, 80C196NU

INTERFACING WITH EXTERNAL MEMORY

CCR0	no direct access†

The chip configuration 0 (CCR0) register enables or disables powerdown and standby (80C196NU only) modes and selects the write-control mode. It also contains the bus-control parameters for fetching chip configuration byte 1.

1	1	WS1	WS0

DEMUX	BHE#	BW16	PD

Bit	Bit			Function
Number	Mnemonic			Function
Number	Mnemonic

7:6	1	To guarantee device operation, write ones to these bits.

5:4	WS1:0	Wait States
		These two bits control the number of wait states that are used for an
		external fetch of CCB1.
		WS0 WS1
		0	0	zero wait states
		0	1	one wait state
		1	0	two wait states
		1	1	three wait states

3	DEMUX	Select Demultiplexed Bus
		Selects the demultiplexed bus mode for an external fetch of CCB1:
		0	= multiplexed — address and data are multiplexed on AD15:0.
		1	= demultiplexed — data only on AD15:0.

2	BHE#	Write-control Mode
		Selects the write-control mode, which determines the functions of the
		BHE#/WRH# and WR#/WRL# pins for external bus cycles:
		0	= write strobe mode: the BHE#/WRH# pin operates as WRH#, and the
			WR#/WRL# pin operates as WRL#.
		1	= standard write-control mode: the BHE#/WRH# pin operates as
			BHE#, and the WR#/WRL# pin operates as WR#.

1	BW16	Buswidth Control
		Selects the bus width for an external fetch of CCB1:
		0	= 8-bit bus
		1	= 16-bit bus

0	PD	Powerdown Enable
		Enables or disables the IDLPD #2 and IDLPD #3 instructions. When
		enabled, the IDLPD #2 instruction causes the microcontroller to enter
		powerdown mode and for the 80C196NU only, the IDLPD #3 instruction
		causes the microcontroller to enter standby mode.
		0	= disable powerdown and standby modes
		1	= enable powerdown and standby modes
		If your design uses powerdown or standby mode, set this bit when you
		program the CCBs. If it does not, clearing this bit when you program the
		CCBs will prevent accidental entry into powerdown and standby mode† .
		(Chapter 12, “Special Operating Modes,” discusses powerdown and
		standby modes.)

†The CCRs are loaded with the contents of the chip configuration bytes (CCBs) after a device reset. The CCBs reside in nonvolatile memory at addresses FF2018H (CCB0) and FF201AH (CCB1).

Figure 13-6. Chip Configuration 0 (CCR0) Register

13-15

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 CCR0, WS1 WS0 Demux BHE#, WS0 WS1

Models: Microcontroller 80C196NU 8XC196NP

CCR0

WS1

WS0

DEMUX

BHE#

Bit

WS0 WS1

BHE#

(Chapter 12, “Special Operating Modes,” discusses powerdown and

Figure 13-6. Chip Configuration 0 (CCR0) Register

Microcontroller, 80C196NU, 8XC196NP specifications