MOTOROLA
MC68341 USER’S MANUAL
4- 1
SECTION 4
SYSTEM INTEGRATION MODULE
The MC68341 system integration module (SIM41) consists of several functions that
control the system start-up, initialization, configuration, and the external bus with a
minimum of external devices. It also provides the IEEE 1149.1 boundary scan capabilities.
The SIM41 includes the following functions:
System Configuration and Protection
Clock Synthesizer
Real-Time Clock
Chip Selects and Wait States
68300/68000 External Bus Interface
Bus Arbitration
Dynamic Bus Sizing
IEEE 1149.1 Test Access Port
4.1 MODULE OVERVIEW
The SIM41 has similar features to the SIM in the MC68330 and MC68340. The periodic
interrupt timer, double bus fault monitor, software watchdog, and spurious interrupt
monitor are identical. However, many of the other features in the SIM differ in their use
and details.
The system configuration and protection function controls system configuration and
provides various monitors and timers, including the internal bus monitor, double bus fault
monitor, spurious interrupt monitor, software watchdog timer, and the periodic interrupt
timer.
The clock synthesizer generates the clock signals used by the SIM41 and the other on-
chip modules, as well as CLKOUT used by external devices.
The real-time clock function has internal interrupt generation capability, and a
programmable output pin that can provide an interrupt on an alarm or time-matching
function.
The programmable chip select function provides eight chip select signals that can enable
external memory and peripheral circuits, providing all handshaking and timing signals.
Each chip select signal has an associated base address register and an address mask
register that contain the programmable characteristics of that chip select. Up to six wait
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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