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MC68HC11A1MFN Datasheet(PDF) 6 Page - Motorola, Inc |
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MC68HC11A1MFN Datasheet(HTML) 6 Page - Motorola, Inc |
6 / 45 page 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. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 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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