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MC68HC711EA9CFN2 bảng dữ liệu(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC68HC711EA9CFN2 bảng dữ liệu(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 58 page MC68HC11EA9 10 MC68HC11EA9TS/D 4 Operating Modes and On-Chip Memory 4.1 Single-Chip Mode In single-chip mode, ports B and C are available for general-purpose parallel I/O. Strobe pins A (STRA) and B (STRB) can be used to control handshaking of parallel I/O on ports B and C. In this mode, all software needed to control the MCU is contained in internal resources. ROM/EPROM (if present) will always be enabled out of reset, ensuring that the reset and interrupt vectors will be available at locations $FFC0–$FFFF. 4.2 Expanded Mode In expanded operating mode, the MCU can access the full 64-Kbyte address space. The space includes the same on-chip memory addresses used for single-chip mode as well as addresses for external pe- ripherals and memory devices. The expansion bus is made up of ports B and C, and control signals AS and R/W. R/W (read/write) and AS (address strobe) allow the low-order address and the 8-bit data bus to be multiplexed on the same pins. During the first half of each bus cycle address information is present. During the second half of each bus cycle the pins become the bidirectional data bus. AS is an active-high latch enable signal for an external address latch. Address information is allowed through the transparent latch while AS is high and is latched when AS drives low. Figure 5 shows an example of address and data demultiplexing. Figure 5 Address/Data Demultiplexing ADDR/DATA DEMUX R/W E WE AS MCU PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 ADDR15 ADDR14 ADDR13 ADDR12 ADDR11 ADDR10 ADDR9 ADDR8 ADDR7 ADDR6 ADDR5 ADDR4 ADDR3 ADDR2 ADDR1 ADDR0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 DATA8 LE DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q0 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Số phần tương tự - MC68HC711EA9CFN2 |
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Mô tả tương tự - MC68HC711EA9CFN2 |
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