mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 37

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
PTB0–PTB7
PTA0/KBA0
PTA7/KBA7
PIN NAME
OSC1
OSC2
V
RST
V
IRQ
V
REG
DD
SS
:
Power supply.
Power supply ground.
Regulated 3.3V output from MCU.
Reset input; active low.
With internal pullup to V
External IRQ pin; with programmable internal pullup to V
and schmitt trigger input.
Used for mode entry selection.
Crystal oscillator input.
Crystal oscillator output; inverting of OSC1 signal.
8-bit general-purpose I/O port.
Pins as keyboard interrupts, KBA0–KBA7.
Each pin has programmable internal pullup to V
configured as input.
8-bit general-purpose I/O port.
Each pin has programmable internal pullup to V
configured as input.
When the USB module is disabled, the PTE4 and PTE3 pins are
general-purpose bidirectional I/O port pins with 10mA sink capability.
Each pin is open-drain when configured as an output; and each pin
contains a software configurable 5k pullup to V
an input. The PTE4 pin can also be enabled to trigger the IRQ interrupt.
When the USB module is enabled, the PTE4/D– and PTE3/D+ pins
become the USB module D– and D+ pins. The D– pin contains a
software configurable 1.5k pullup to V
Interface Module
(USB)
Summary of the pin functions are provided in
Table 1-1. Summary of Pin Functions
and
PIN DESCRIPTION
DD
Section 12. Input/Output Ports
and schmitt trigger input.
General Description
(TIM),
Section 9. Universal Serial Bus Module
REG
REG
when
when
DD
REG
. (See
(I/O).)
IN/OUT
IN/OUT
IN/OUT
IN/OUT
Table
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
DD
Section 11. Timer
when configured as
1-1.
VOLTAGE LEVEL
General Description
V
REG
V
Pin Assignments
4.0 to 5.5V
REG
Technical Data
to V
V
V
V
V
V
V
V
V
V
0V
REG
REG
REG
REG
REG
REG
REG
DD
DD
(3.3V)
DD
+V
HI
37