M68ICS08GR datasheet(227/408 Pages) FREESCALE

No. de pieza	M68ICS08GR

Descripción Electrónicos	M68HC08 Microcontrollers

PDF	408 Pages

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Fabricante Electrónico	FREESCALE [Freescale Semiconductor, Inc]

Página de inicio	http://www.freescale.com

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Input/Output Ports (I/O)

Port E

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Input/Output Ports (I/O)

227

Figure 16-19. Port E I/O Circuit

When bit DDREx is a logic 1, reading address $0008 reads the PTEx

data latch. When bit DDREx is a logic 0, reading address $0008 reads

the voltage level on the pin. The data latch can always be written,

regardless of the state of its data direction bit. Table 16-6 summarizes

the operation of the port E pins.

READ DDRE ($000C)

WRITE DDRE ($000C)

RESET

WRITE PTE ($0008)

READ PTE ($0008)

PTEx

DDREx

PTEx

Table 16-6. Port E Pin Functions

DDRE Bit

PTE Bit

I/O Pin Mode

Accesses to DDRE

Accesses to PTE

Read/Write

Read

Write

X(1)

Input, Hi-Z(2)

DDRE1–DDRE0

PTE1–PTE0(3)

Output

DDRE1–DDRE0]

PTE1–PTE0

Notes:

1. X = Don’t care

2. Hi-Z = High impedance

3. Writing affects data register, but does not affect input.

Freescale Semiconductor, Inc.

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M68ICS08GR Datasheet(PDF) 227 Page - Freescale Semiconductor, Inc

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