Datasheet

MCU Block Diagram
MC68HC908JL3E Family Data Sheet, Rev. 4
Freescale Semiconductor 17
1.3 MCU Block Diagram
Figure 1-1 shows the structure of the MC68H(R)C908JL3E.
Figure 1-1. MCU Block Diagram
SYSTEM INTEGRATION
MODULE
ARITHMETIC/LOGIC
UNIT (ALU)
CPU
REGISTERS
M68HC08 CPU
CONTROL AND STATUS REGISTERS — 64 BYTES
USER FLASH:
USER RAM — 128 BYTES
MONITOR ROM — 960 BYTES
USER FLASH VECTOR SPACE — 48 BYTES
EXTERNAL INTERRUPT
MODULE
INTERNAL BUS
* RST
* IRQ
POWER
VSS
2-CHANNEL TIMER INTERFACE
MODULE
KEYBOARD INTERRUPT
MODULE
8-BIT ANALOG-TO-DIGITAL
CONVERTER MODULE
VDD
ADC REFERENCE
DDRB
PORTB
PTB7/ADC7
PTB6/ADC6
PTB5/ADC5
PTB4/ADC4
PTB3/ADC3
PTB2/ADC2
PTB1/ADC1
PTB0/ADC0
DDRA
PORTA
PTA6/KBI6**
¥
PTA5/KBI5**
‡
PTA4/KBI4**
‡
PTA3/KBI3**
‡
PTA2/KBI2**
‡
PTA1/KBI1**
‡
PTA0/KBI0**
‡
LOW-VOLTAGE INHIBIT
MODULE
* Pin contains integrated pull-up device.
** Pin contains programmable pull-up device.
† 25mA open-drain if output pin.
‡ LED direct sink pin.
OSC1
¥
OSC2
X-TAL OSCILLATOR
RC OSCILLATOR
DDRD
PORTD
PTD7**
†‡
PTD6**
†‡
PTD5/TCH1
PTD4/TCH0
PTD3/ADC8
‡
PTD2/ADC9
‡
PTD1/ADC10
PTD0/ADC11
COMPUTER OPERATING
PROPERLY MODULE
MC68H(R)C908JK1E — 1,536 BYTES
POWER-ON RESET
MODULE
BREAK
MODULE
#
#
# Pins available on MC68H(R)C908JL3E only.
MC68HRC908JL3E/JK3E/JK1E
MC68HC908JL3E/JK3E/JK1E
¥ Shared pin:
MC68HRC908JL3E/JK3E/JK1E — RCCLK/PTA6/KBI6
MC68H(R)C908JK3E/JL3E — 4,096 BYTES
MC68HC908JL3E/JK3E/JK1E — OSC2