Freescale Semiconductor MC68HC08KH12 manual Port E, Port D Pin Functions, 195

		Table 12-5. Port D Pin Functions
			Accesses to	Accesses to PTD
DDRD	PTD Bit	I/O Pin Mode	DDRD
Bit
			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.

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.

Address:

Read:

Write:

Reset:

Alternate Function:

Alternate Function:

$0008
Bit 7	6	5	4	3	2	1	Bit 0
0	0	0	PTE4	PTE3	PTE2	PTE1	PTE0
			Unaffected by reset
	= Unimplemented
				KBE3	KBE2	KBE1	KBE0
					TCH1	TCH0	TCLK

	Figure 12-13. Port E Data Register (PTE)
MC68HC(7)08KH12 — Rev. 1.1	Advance Information
Freescale Semiconductor	195