MC68HC05L16 Datasheet, PDF(21/146 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC05L16 Datasheet, PDF (21/146 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Modes of Operation

SINGLE-CHIP MODE

RESET

VDD

VSS

IRQ1

VTST

VDD

VSS

IRQ2

VTST = 2 x VDD

VDD

VSS

Figure 1-5. Mode Entry Diagram

1.6.2 Single-Chip Mode (SCM)

In this mode, all address and data bus activity occurs within the MCU. Thus, no external pins are required

for these functions. The single-chip mode allows the maximum number of I/O pins for on-chip peripheral

functions, for example, ports A through E, and LCD drivers.

1.6.3 Self-Check Mode

In this mode, the reset vector is fetched from a 496-byte internal self-check ROM at $FE00â$FFEF. The

self-check ROM contains a self-check program to test the functions of internal modules.

Since this mode is not a normal user mode, all of the privileged control bits are accessible. This allows

the self-check mode to be used for self- test of the device.

MC68HC05L16 â¢ MC68HC705L16 Data Sheet, Rev. 4.1

Freescale Semiconductor

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