M68ICS08GR datasheet(225/408 Pages) FREESCALE

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Input/Output Ports (I/O)

Port E

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Input/Output Ports (I/O)

225

16.7 Port E

Port E is a 2-bit special-function port that shares two of its pins with the

serial communications interface (SCI) module.

16.7.1 Port E Data Register

The port E data register contains a data latch for each of the two port E

pins.

PTE1 and PTE0 — Port E Data Bits

PTE1 and PTE0 are read/write, software programmable bits. Data

direction of each port E pin is under the control of the corresponding

bit in data direction register E.

NOTE:

Data direction register E (DDRE) does not affect the data direction of

port E pins that are being used by the SCI module. However, the DDRE

bits always determine whether reading port E returns the states of the

latches or the states of the pins. See Table 16-6.

RxD — SCI Receive Data Input

The PTE1/RxD pin is the receive data input for the SCI module. When

the enable SCI bit, ENSCI, is clear, the SCI module is disabled, and

the PTE1/RxD pin is available for general-purpose I/O. See Serial

Communications Interface (SCI).

Address:

$0008

Bit 7

654321

Bit 0

Read:

000000

PTE1

PTE0

Write:

Reset:

Unaffected by reset

Alternate

Function:

RxD

TxD

= Unimplemented

Figure 16-17. Port E Data Register (PTE)

Freescale Semiconductor, Inc.

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