MC68HC11A1MFN datasheet(6/45 Pages) MOTOROLA

Part #	MC68HC11A1MFN

Description	8-Bit Microcontroller

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Manufacturer	MOTOROLA [Motorola, Inc]

Direct Link	http://www.freescale.com

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MOTOROLA

MC68HC11A8

6

MC68HC11A8TS/D

Figure 3 48-Pin DIP Pin Assignments

2 Operating Modes and Memory Maps

In single-chip operating mode, the MC68HC11A8 is a monolithic microcontroller without external ad-

dress or data buses.

In expanded multiplexed operating mode, the MCU can access a 64 Kbyte address space. The space

includes the same on-chip memory addresses used for single-chip mode plus external peripheral and

memory devices. The expansion bus is made up of ports B and C and control signals AS and R/W. The

address, R/W, and AS signals are active and valid for all bus cycles including accesses to internal mem-

ory locations. The following figure illustrates a recommended method of demultiplexing low-order ad-

dresses from data at port C.

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PA7/PAI/OC1

PA6/OC2/OC1

PA5/OC3/OC1

PA4/OC4/OC1

PA3/OC5/OC1

PA2/IC1

PA1/IC2

PA0/IC3

PB7/A15

PB6/A14

PB5/A13

PB4/A12

PB3/A11

PB2/A10

PB1/A9

PB0/A8

PE0/AN0

PE1/AN1

PE2/AN2

PE3/AN3

MODB/VSTBY

VRL

VRH

VSS

VDD

PD5/SS

PD4/SCK

PD3/MOSI

PD2/MISO

PD1/TxD

PD0/RxD

IRQ

XIRQ

RESET

PC7/A7/D7

PC6/A6/D6

PC5/A5/D5

PC4/A4/D4

PC3/A3/D3

PC2/A2/D2

PC1/A1/D1

PC0/A0/D0

XTAL

EXTAL

STRB/ R/W

E

STRA/AS

MODA/LIR

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MC68HC11A1MFN Datasheet(PDF) 6 Page - Motorola, Inc

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