NXP Semiconductors
UM11227
NTM88 family of tire pressure monitor sensors
UM11227 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 6 — 24 April 2020
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7.3 Orientation
Figure 4.  NTM88 orientation at rest.
8 Central processing unit
8.1 Introduction
This section provides summary information about the registers, addressing modes, and
instruction set of the CPU of the HCS08 Family. For a more detailed discussion, refer to
the HCS08 Family Reference Manual, volume 1, NXP Semiconductor document order
number HCS08RMV1/D.
The HCS08 CPU is fully source- and object-code-compatible with the M68HC08 CPU.
Several instructions and enhanced addressing modes were added to improve C compiler
efficiency and to support a new BACKGROUND DEBUG system which replaces the
monitor mode of earlier M68HC08 microcontrollers (MCU).
8.2 Features
Features of the HCS08 CPU include:
• Object code fully upward compatible with M68HC05 and M68HC08 Families
• All registers and memory are mapped to a single 64 kB address space
• 16-bit stack pointer (any size stack anywhere in 64 kB address space)
• 16-bit index register (H:X) with powerful indexed addressing modes
• 8-bit accumulator (A)
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