Peripheral Simulation

For Dallas Semiconductor DS89C420 — 1 Clock per Machine Cycle

Simulation support for this peripheral or feature is comprised of:

• Accurate simulation of special on-chip features.

These simulation capabilities are described below.

1 Clock per Machine Cycle

The standard 8051 MCU requires 12 clocks per machine cycle. The DS89C420 MCU is a high-speed 8051-compatible core that requires only 1 clock per machine cycle. As a result, the fastest instruction on a standard 8051 will execute 12 times faster on the DS89C420 MCU. Because this increase in instruction execution speed could result in timing diffulties with slower external memory or peripherals, the execution time of the MOVX instruction may be configured to allow access these slower devices. See the Stretch Cycle and Clock Control sections for more information regarding this feature.