HOLD#, HLDA# Timing Definitions, Symbol Parameter

INTERFACING WITH EXTERNAL MEMORY

.
CLKOUT
T	THVCH
HVCH
HOLD#	Hold Latency
HOLD#
TCLHAL	TCLHAH
HLDA#
TCLBRL	TCLBRH
	TCLBRH
BREQ#
THALAZ	THAHAX
	THAHAX
A19:0, AD15:0
THALBZ	T
CSx#, BHE#,	HAHBV
CSx#, BHE#,
INST, RD#, WR#	Weakly held inactive
WRL#, WRH#	TCLLH
	TCLLH
ALE
	Start of strongly driven ALE
	A2460-03
Figure 13-16. HOLD#, HLDA# Timing

Table 13-12. HOLD#, HLDA# Timing Definitions

Symbol	Parameter

THVCH	HOLD# Setup Time
TCLHAL	CLKOUT Low to HLDA# Low
TCLHAH	CLKOUT Low to HLDA# High
TCLBRL	CLKOUT Low to BREQ# Low
TCLBRH	CLKOUT Low to BREQ# High
THALAZ	HLDA# Low to Address Float
THAHAX	HLDA# High to Address No Longer Float
THALBZ	HLDA# Low to BHE#, INST, RD#, WR#, WRL#, WRH#
	Weakly Driven

THAHBV	HLDA# High to BHE#, INST, RD#, WR#, WRL#, WRH# valid
TCLLH	Clock Falling to ALE Rising; Use to derive other timings.

When the external device is finished with the bus, it relinquishes control by driving HOLD# high. In response, the 8XC196Nx deasserts HLDA# and resumes control of the bus.

13-31

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 80C196NU, 8XC196NP, Microcontroller manual HOLD#, HLDA# Timing Definitions, Symbol Parameter

Models: Microcontroller 80C196NU 8XC196NP

CLKOUT

Figure 13-16. HOLD#, HLDA# Timing

Table 13-12. HOLD#, HLDA# Timing Definitions

Symbol

Parameter

Microcontroller, 80C196NU, 8XC196NP specifications