MC68HC05L28 Datasheet, PDF(23/156 Page) Motorola, Inc – Flexible general-purpose microcomputer

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MC68HC05L28 Datasheet, PDF (23/156 Pages) Motorola, Inc – Flexible general-purpose microcomputer

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2

2

MODES OF OPERATION AND PIN

DESCRIPTIONS

2.1

Modes of operation

The MC68HC05L28 has two modes of operation available to the user â single chip and RAM

bootloader. The MC68HC705L28 also has two modes of operation â single chip and EPROM/RAM

bootloader. Table 2-1 and Table 2-2 show the conditions required to enter each mode on the rising

edge of RESET.

Table 2-1 MC68HC05L28 operating mode entry conditions

IRQ0/VPP PB2 PB3 PB6

Mode

VSS to VDD

x

2 x VDD

1

2 x VDD

1

x

x Single chip

0

VDD RAM bootloader

Jump to RAM ($81)

1

V DD

Load/execute RAM

Table 2-2 MC68HC705L28 operating mode entry conditions

IRQ0/VPP PB2 PB3 PB6

Mode

VSS to VDD

x

2 x VDD

0

2 x VDD

0

2 x VDD

1

2 x VDD

1

x

x Single chip

0

VDD EPROM bootloader Verify only

1

V DD

Program/verify

0

VDD RAM bootloader

Jump to RAM ($81)

1

V DD

Load/execute RAM

MC68HC05L28 MODES OF OPERATION AND PIN DESCRIPTIONS

TPG

MOTOROLA

2-1

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