M68HC11K_13 Datasheet, PDF (231/290 Pages) Freescale Semiconductor, Inc – M68HC11K Family Technical Data

Freescale Semiconductor, Inc.
Technical Data — M68HC11K Family
Section 11. Memory Expansion and Chip Selects
11.1 Contents
11.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
11.3 Memory Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
11.3.1 Memory Size and Address Line Allocation. . . . . . . . . . . . . 232
11.3.2 Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .234
11.3.2.1 Port G Assignment Register . . . . . . . . . . . . . . . . . . . . . 234
11.3.2.2 Memory Mapping Size Register . . . . . . . . . . . . . . . . . . .235
11.3.2.3 Memory Mapping Window Base Register . . . . . . . . . . . 236
11.3.2.4 Memory Mapping Window Control Registers. . . . . . . . .237
11.4 Chip Selects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
11.4.1 Program Chip Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
11.4.2 Input/Output Chip Select . . . . . . . . . . . . . . . . . . . . . . . . . . 241
11.4.3 General-Purpose Chip Selects. . . . . . . . . . . . . . . . . . . . . . 242
11.4.3.1 Memory Mapping Size Register . . . . . . . . . . . . . . . . . . .243
11.4.3.2 General-Purpose Chip Select 1 Address Register. . . . .243
11.4.3.3 General-Purpose Chip Select 1 Control Register . . . . . 244
11.4.3.4 General-Purpose Chip Select 2 Address Register. . . . .245
11.4.3.5 General-Purpose Chip Select 2 Control Register . . . . . 245
11.4.4 One Chip Select Driving Another . . . . . . . . . . . . . . . . . . . . 246
11.4.4.1 General-Purpose Chip Select 1 Control Register . . . . . 247
11.4.4.2 General-Purpose Chip Select 2 Control Register . . . . . 247
11.4.5 Clock Stretching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248
11.5 Memory Expansion Examples . . . . . . . . . . . . . . . . . . . . . . . . 249
11.2 Introduction
This section provides descriptions of the expanded memory and the chip
selects.
M68HC11K Family
MOTOROLA
Memory Expansion and Chip Selects
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Technical Data
231