mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 276

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
Technical Data
276
NOTE:
D– and D+ — USB Data Pins
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
TCLK — Timer Clock Input
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
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
D– and D+ are the differential data lines used by the USB module.
(See
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
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
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
Module
Section 11. Universal Serial Bus Module
11.8.8 USB Control Register
(TIM).)
Section 10. Timer Interface Module
Input/Output (I/O) Ports
15.9 IRQ Option Control
3.)
Section 10. Timer Interface
MC68HC908JB16
Freescale Semiconductor
14.7 Port
(TIM).)
(USB).)
Register.)
Options.)
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Rev. 1.1