Datasheet

General Description
MCU Block Diagram
MC68HC908LJ24/LK24 — Rev. 2.1 Data Sheet
Freescale Semiconductor General Description 41
Figure 1-1. MC68HC908LJ24 Block Diagram
SYSTEM INTEGRATION
MODULE
ARITHMETIC/LOGIC
UNIT (ALU)
CPU
REGISTERS
M68HC08 CPU
CONTROL AND STATUS REGISTERS — 128 BYTES
USER FLASH — 24,576 BYTES
USER RAM — 768 BYTES
MONITOR ROM — 959 BYTES
USER FLASH VECTOR SPACE — 48 BYTES
EXTERNAL INTERRUPT
MODULE
DDRD
PORTD
INTERNAL BUS
* RST
* IRQ
COMPUTER OPERATING
PROPERLY MODULE
PTD7/KBI7/SDA
PTD6/KBI6/SCL
PTD5/KBI5/T2CLK**
PTD4/KBI4/T1CLK**
PTD3/SPSCK/CALOUT
PTD2/MOSI
POWER-ON RESET
MODULE
POWER
VSS
VDDA
PTD1/MISO
PTD0/SS
/CALIN
REAL TIME CLOCK
MODULE
2-CHANNEL TIMER INTERFACE
MODULE 1
2-CHANNEL TIMER INTERFACE
MODULE 2
LIQUID CRYSTAL DISPLAY
DRIVER MODULE
SERIAL PERIPHERAL
INTERFACE MODULE
KEYBOARD INTERRUPT
MODULE
10-BIT ANALOG-TO-DIGITAL
CONVERTER MODULE
CLOCK GENERATOR MODULE
OSC1
OSC2
CGMXFC
32.768-kHz OSCILLATOR
PHASE-LOCKED LOOP
FP0/BP3
VDD
ADC REFERENCE
VREFL
VREFH
DDRB
PORTB
PTB7/ADC5
PTB6/ADC4
PTB5/T2CH1
†
PTB4/T2CH0
†
PTB3/T1CH1
†
PTB2/T1CH0
†
PTB1/RxD
†
PTB0/TxD
†
DDRA
PORTA
PTA7/ADC3
PTA6/ADC2
PTA5/ADC1
PTA4/ADC0
PTA3/KBI3**
PTA2/KBI2**
PTA1/KBI1**
PTA0/KBI0**
* Pin contains integrated pullup device.
** Pin contains integrated pullup device if configured as KBI.
†
High current sink pin, 15mA.
SERIAL COMMUNICATIONS
INTERFACE MODULE
(WITH INFRARED
ENCODER/DECODER)
#
# Pins available on 80-pin packages only.
INTER IC BUS
INTERFACE MODULE
PORTF
DDRF
LOW-VOLTAGE INHIBIT
MODULE
# VLCD
PTF7
†
:
PTF0
†
PORTC
DDRC
PTC7/FP26
†
:
PTC0/FP19
†
PORTE
DDRE
PTE7/FP18
†
:
PTE0/FP11
†
FP32
:
FP27
FP10
:
FP1
BP2
:
BP0