AT89C51SND1C-7HTUL Atmel, AT89C51SND1C-7HTUL Datasheet - Page 27
AT89C51SND1C-7HTUL
Manufacturer Part Number
AT89C51SND1C-7HTUL
Description
IC MCU 64KB FLASH MEM 81-CBGA
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT80C51SND1C-ROTIL.pdf
(213 pages)
Specifications of AT89C51SND1C-7HTUL
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
Peripherals
Audio, I²S, MP3, PCM, POR, WDT
Number Of I /o
44
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.3 V
Data Converters
A/D 2x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
81-CBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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7.1.2
7.1.3
7.2
7.2.1
4109L–8051–02/08
External Space
Upper 128 Bytes RAM
Expanded RAM
Memory Interface
The next 16 Bytes above the register banks form a block of bit-addressable memory space. The
C51 instruction set includes a wide selection of single-bit instructions, and the 128 bits in this
area can be directly addressed by these instructions. The bit addresses in this area are 00h to
7Fh.
Figure 2. Lower 128 Bytes Internal RAM Organization
The upper 128 Bytes of RAM are accessible from address 80h to FFh using only indirect
addressing mode.
The on-chip 2K Bytes of expanded RAM (ERAM) are accessible from address 0000h to 07FFh
using indirect addressing mode through MOVX instructions. In this address range, EXTRAM bit
in AUXR register (see Table 30) is used to select the ERAM (default) or the XRAM. As shown in
Figure 1 when EXTRAM = 0, the ERAM is selected and when EXTRAM = 1, the XRAM is
selected (see Section “External Space”).
The ERAM memory can be resized using XRS1:0 bits in AUXR register to dynamically increase
external access to the XRAM space. Table 27 details the selected ERAM size and address
range.
Table 27. ERAM Size Selection
Note:
The external memory interface comprises the external bus (port 0 and port 2) as well as the bus
control signals (RD, WR, and ALE).
Lower 128 Bytes RAM, Upper 128 Bytes RAM, and expanded RAM are made of volatile memory
cells. This means that the RAM content is indeterminate after power-up and must then be initial-
ized properly.
XRS1
0
0
1
1
30h
20h
18h
10h
08h
00h
XRS0
0
1
0
1
7Fh
2Fh
1Fh
0Fh
ERAM Size
256 Bytes
512 Bytes
1K Byte
2K Bytes
17h
07h
Bit-Addressable Space
(Bit Addresses 0-7Fh)
4 Banks of
8 Registers
R0-R7
AT8xC51SND1C
Address
0 to 00FFh
0 to 01FFh
0 to 03FFh
0 to 07FFh
27
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