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| MC68HC08LT8 Datasheet, PDF (17/156 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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1.5 Pin Functions
Description of the pin functions are provided in Table 1-1.
Pin Functions
Table 1-1. Pin Functions
Pin Name
VDD
VSS
VLCD
RST
IRQ
OSC1
OSC2
XTAL1
XTAL2
BP0âBP2
BP3/FP0
PTA0/KBI0
PTA1/KBI1
PTA2/KBI2
PTA3/KBI3
PTA4
PTA5
PTA6
PTA7
PTB0/T2CH0
PTB1/T2CH1
PTB2/T1CH0/PPIECK
PTB3/T1CH1
PTB6/FP1
PTB7/FP2
Pin Description
Power supply
Power supply ground
LCD bias voltage
Reset input, active low; with internal pull up and Schmitt trigger
input
External IRQ pin; with programmable internal pull up and Schmitt
trigger input
Used for monitor mode entry
Crystal input for 16-MHz system clock
Crystal oscillator output; inverted OSC1 signal
Crystal input for 32.768-kHz for subsystem clock
Crystal oscillator output; inverted XTAL1 signal
LCD backplane drivers
LCD backplane driver BP3 or frontplane driver FP0
8-bit general-purpose I/O port
PTA0âPTA3 as keyboard interrupts with pull-up device,
KBI0âKBI3
8-bit general-purpose I/O port,
with high current sinks on PTB2âPTB3
PTB0 as T2CH0 of TIM2
PTB1 as T2CH1 of TIM2
PTB2 as PPIECK; external clock source input for PPI
PTB2 as T1CH0 of TIM1
PTB3 as T1CH1 of TIM1
PTB6âPTB7 as LCD frontplane drivers, FP1âFP2
Input/Output
Input
Output
Input
Input/output
Input
Input
Input
Output
Input
Output
Output
Output
Input/output
Input
Input/output
Input/output
Input/output
Input
Input/output
Input/output
Output
Voltage
Level
5 V or 3 V
0V
VDD
VDD
VDD
VDD to VTST
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
Continued on next page
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
17
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