M68HC08 datasheet(17/172 Pages) FREESCALE

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MCU Block Diagram

MC68HC908JL3E Family Data Sheet, Rev. 3

Freescale Semiconductor

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

* IRQ1

POWER

VSS

2-CHANNEL TIMER INTERFACE

MODULE

KEYBOARD INTERRUPT

MODULE

8-BIT ANALOG-TO-DIGITAL

CONVERTER MODULE

VDD

ADC REFERENCE

PTB7/ADC7

PTB6/ADC6

PTB5/ADC5

PTB4/ADC4

PTB3/ADC3

PTB2/ADC2

PTB1/ADC1

PTB0/ADC0

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

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

M68HC08 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

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