AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 29
AT89C5131A-M
Manufacturer Part Number
AT89C5131A-M
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89C5130A-M.pdf
(188 pages)
2.AT89C5130A-M.pdf
(4 pages)
3.AT89C5130A-M.pdf
(34 pages)
Specifications of AT89C5131A-M
Flash (kbytes)
32 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
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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
29
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