7 port e, 1 port e data register (pte), Port e – Freescale Semiconductor MC68HC08KH12 User Manual

Page 195: Port e data register (pte), 13 port e data register (pte), Port d pin functions

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MC68HC(7)08KH12

Rev. 1.1

Advance Information

Freescale Semiconductor

195

12.7 Port E

Port E is a 5-bit special function port that shares four of its pins with the
keyboard interrupt module (KBI) and shares three of its pins with the
timer interface module (TIM). PTE3–PTE0 pins have built-in schmitt
triggered input and software configurable pull-up; In addition,
PTE3–PTE0 pins have built-in optical interface circuit which can be
enabled via the Port-E Optical Interface Enable Register.

12.7.1 Port E Data Register (PTE)

The port E data register contains a data latch for each of the five port E
pins.

Table 12-5. Port D Pin Functions

DDRD

Bit

PTD Bit

I/O Pin Mode

Accesses to

DDRD

Accesses to PTD

Read/Write

Read

Write

0

X

(1)

Input, Hi-Z

(2)

DDRD[7:0]

Pin

PTD[7:0]

(3)

1

X

Output

DDRD[7:0]

PTD[7:0]

PTD[7:0]

1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.

Address:

$0008

Bit 7

6

5

4

3

2

1

Bit 0

Read:

0

0

0

PTE4

PTE3

PTE2

PTE1

PTE0

Write:

Reset:

Unaffected by reset

= Unimplemented

Alternate

Function:

KBE3

KBE2

KBE1

KBE0

Alternate

Function:

TCH1

TCH0

TCLK

Figure 12-13. Port E Data Register (PTE)

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