M68CBL05C datasheet(21/286 Pages) FREESCALE

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MCU Block Diagram

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

1.3 MCU Block Diagram

Figure 1-1 shows the structure of the MC68HC908GR8.

Figure 1-1. MCU Block Diagram

SINGLE BRKPT BREAK

MODULE

CLOCK GENERATOR MODULE

24 INTR SYSTEM INTEGRATION

MODULE

PROGR. TIMEBASE

MODULE

MONITOR MODULE

SERIAL PERIPHERAL

1-CHANNEL TIMER INTERFACE

MODULE 2

DUAL V. LOW-VOLTAGE INHIBIT

MODULE

4-BIT KEYBOARD

ARITHMETIC/LOGIC

UNIT (ALU)

CPU

REGISTERS

M68HC08 CPU

CONTROL AND STATUS REGISTERS — 64 BYTES

MC68HC908GR8 USER FLASH — 7680 BYTES

USER RAM — 384 BYTES

MONITOR ROM — 310 BYTES

USER FLASH VECTOR SPACE — 36 BYTES

SINGLE EXTERNAL IRQ

MODULE

INTERNAL BUS

OSC1

OSC2

CGMXFC

* RST

* IRQ

INTERFACE MODULE

INTERRUPT MODULE

COMPUTER OPERATING

PROPERLY MODULE

PTA3/KBD3–

VDDAD / VREFH

8-BIT ANALOG-TO-DIGITAL

CONVERTER MODULE

PTD6/T2CH0 †

PTD5/T1CH1 †

PTD4/T1CH0 †

PTD3/SPSCK †

PTD2/MOSI †

PTD1/MISO †

PTD0/SS †

PTE1/RxD

PTE0/TxD

VSSAD / VREFL

2-CHANNEL TIMER INTERFACE

MODULE 1

32-kHz OSCILLATOR

PHASE-LOCKED LOOP

SERIAL COMMUNICATIONS

INTERFACE MODULE

DATA BUS SWITCH

MODULE

MEMORY MAP

MODULE

MASK OPTION REGISTER1

MODULE

SECURITY

MODULE

POWER

VSS

VDD

VSSA

VDDA

† Ports are software configurable with pullup device if input port.

‡ Higher current drive port pins

* Pin contains integrated pullup device

MONITOR MODE ENTRY

MODULE

PTB5/AD5–

PTC1–PTC0 † ‡

POWER-ON RESET

MODULE

FLASH PROGRAMMING (BURN-IN) ROM — 544 BYTES

MASK OPTION REGISTER2

MODULE

MC68HC908GR4 USER FLASH — 4096BYTES

PTA0/KBD0 †

PTB0/AD0

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