AT89C5130A-M Atmel Corporation, AT89C5130A-M Datasheet - Page 29

• Manufacturer Part Number: AT89C5130A-M
• Manufacturer: Atmel Corporation

Specifications of AT89C5130A-M

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

8. Program/Code Memory
8.1
8.1.1
4337K–USB–04/08
External Code Memory Access
Memory Interface
The AT89C5130A/31A-M implement 16/ 32 Kbytes of on-chip program/code memory. Figure 8-
1 shows the split of internal and external program/code memory spaces depending on the
product.
The Flash memory increases EPROM and ROM functionality by in-circuit electrical erasure and
programming. Thanks to the internal charge pump, the high voltage needed for programming or
erasing Flash cells is generated on-chip using the standard V
ory can be programmed using only one voltage and allows In- application Software
Programming commonly known as IAP. Hardware programming mode is also available using
specific programming tool.
Figure 8-1.
Note:
The external memory interface comprises the external bus (Port 0 and Port 2) as well as the bus
control signals (PSEN, and ALE).
Figure 8-2 shows the structure of the external address bus. P0 carries address A7:0 while P2
carries address A15:8. Data D7:0 is multiplexed with A7:0 on P0. Table 8-1 describes the exter-
nal memory interface signals.
If the program executes exclusively from on-chip code memory (not from external memory),
beware of executing code from the upper byte of on-chip memory (3FFFh/7FFFh) and thereby
disrupting I/O Ports 0 and 2 due to external prefetch. Fetching code constant from this location
does not affect Ports 0 and 2.
FFFFh
3FFFh
4000h
0000h
Program/Code Memory Organization
AT89C5130A
External Code
48 Kbytes
16 Kbytes
Flash
AT89C5130A/31A-M
DD
FFFFh
7FFFh
8000h
0000h
voltage. Thus, the Flash Mem-
AT89C5131A
External Code
32 Kbytes
32 Kbytes
Flash
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