MC908JB16DWE Datasheet, PDF (276/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
The PTE[2:0] pullup enable bit, PTE20P, in the port option control
register (POCR) enables pullups on PTE2–PTE0, regardless of the
pin is configured as an input or an output. (See 14.7 Port Options.)
PTE4 pin functions as an external interrupt when PTE4IE=1 in the
IRQ option control register (IOCR) and USBEN=0 in the USB address
register (USB disabled). (See 15.9 IRQ Option Control Register.)
D– and D+ — USB Data Pins
D– and D+ are the differential data lines used by the USB module.
(See Section 11. Universal Serial Bus Module (USB).)
The USB module enable bit, USBEN, in the USB address register
(UADDR) controls the pin options for PTE4/D– and PTE3/D+. When
the USB module is enabled, PTE4/D– and PTE3/D+ function as USB
data pins D– and D+. When the USB module is disabled, PTE4/D–
and PTE3/D+ function as 10mA open-drain high current pins for PS/2
clock and data use.
The pullup enable bit, PULLEN, in the USB control register 3 (UCR3)
enables a 1.5kΩ pullup on D– pin when the USB module is enabled.
(See 11.8.8 USB Control Register 3.)
NOTE:
PTE4/D– pin has two programmable pullup resistors. One is used for
PTE4 when the USB module is disabled and another is used for D–
when the USB module is enabled.
T2CH01 and T1CH01 — Timer Channel I/O Bits
The PTE2/T2CH01 and PTE1/T1CH01 pins are the respective TIM2
and TIM1 input capture/output compare pins. The edge/level select
bits, ELSxB and ELSxA, determine whether the PTE2/T2CH01 and
PTE1/T1CH01 pins are timer channel I/O pins or general-purpose I/O
pins. (See Section 10. Timer Interface Module (TIM).)
TCLK — Timer Clock Input
The PTE0/TCLK pin is the external clock input for TIM1 and TIM2.
The prescaler select bits, PS[2:0], select PTE0/TCLK as the TIM
clock input. When not selected as the TIM clock, PTE0/TCLK is
available for general purpose I/O. (See Section 10. Timer Interface
Module (TIM).)
Technical Data
276
Input/Output (I/O) Ports
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor