SPMCK16Z4MPV20 datasheet(108/500 Pages) FREESCALE

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SYSTEM INTEGRATION MODULE

M68HC16 Z SERIES

5-2

USER’S MANUAL

Figure 5-1 System Integration Module Block Diagram

5.2 System Configuration

The SIM configuration register (SIMCR) governs several aspects of system operation.

The following paragraphs describe those configuration options controlled by SIMCR.

5.2.1 Module Mapping

Control registers for all the modules in the microcontroller are mapped into a 4-Kbyte

block. The state of the module mapping (MM) bit in the SIM configuration register

(SIMCR) determines where the control register block is located in the system memory

map. When MM = 0, register addresses range from $7FF000 to $7FFFFF; when MM

= 1, register addresses range from $FFF000 to $FFFFFF.

In M68HC16 Z-series MCUs, ADDR[23:20] follow the logic state of ADDR19 unless

externally driven. MM corresponds to IMB ADDR23. If MM is cleared, the SIM maps

IMB modules into address space $7FF000 – $7FFFFF, which is inaccessible to the

CPU16. Modules remain inaccessible until reset occurs. The reset state of MM is one,

but the bit can be written once. Initialization software should make certain MM remains

set.

Z SERIES SIM BLOCK

SYSTEM CONFIGURATION

CLOCK SYNTHESIZER

CHIP-SELECTS

EXTERNAL BUS INTERFACE

FACTORY TEST

CLKOUT

EXTAL

MODCLK

CHIP-SELECTS

EXTERNAL BUS

RESET

TSC

FREEZE/QUOT

XTAL

SYSTEM PROTECTION

Freescale Semiconductor, Inc.

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SPMCK16Z4MPV20 Datasheet(PDF) 108 Page - Freescale Semiconductor, Inc