MC9S12T64 Datasheet, PDF (85/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Registers
Contents
Register Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
General Purpose Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Register Block
The register block can be mapped to any 2K byte boundary within the
first 32K byte of the standard 64K byte address space by manipulating
bits REG[14:11] in the INITRG register. INITRG establishes the upper
five bits of the register block’s 16-bit address. The register block
occupies 1K byte. Default addressing (after reset) is indicated in the
table below.
Non-user Registers
Non-user registers are divided in three categories: Reserved,
Unimplemented and Reserved for Factory Test. A detailed description
follows below;
Reserved Registers Reserved registers return logic zero when read. Writes to these registers
have no effect.
Unimplemented
Registers
Unimplemented registers return unpredictable values when read. Writes
to these registers have no effect.
Reserved for
Factory Test
Registers
Reserved for Factory Test registers return unpredictable values when
read. Writes to these registers have no effect in Normal modes. Writing
to these registers in Special modes might result in unpredictable MCU
behavior.
Registers
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MC9S12T64Revision 1.1.1