AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 133

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Registers
4109E–8051–06/03
Table 121. External Data Memory Interface Signals
Table 122. DAT16H Register
DAT16H (S:F9h) – Data 16 High Order Byte
Reset Value =XXXX XXXXb
Signal
Name
Number
AD7:0
A15:8
ALE
WR
RD
D15
7 - 0
Bit
7
Type
I/O
I/O
O
O
O
Mnemonic Description
D15:8
D14
Bit
6
Description
Address Lines
Upper address lines for the external bus.
Multiplexed higher address and data lines for the IDE interface.
Address/Data Lines
Multiplexed lower address and data lines for the IDE interface.
Address Latch Enable
ALE signals indicates that valid address information is available on lines
AD7:0.
Read
Read signal output to external data memory.
Write
Write signal output to external memory.
Data 16 High Order Byte
When EXT16 bit is set, DAT16H is set by software with the high order data Byte
prior any MOVX write instruction.
When EXT16 bit is set, DAT16H contains the high order data Byte after any
MOVX read instruction.
D13
5
D12
4
D11
3
AT8xC51SND1C
D10
2
D9
1
Alternate
Function
P2.7:0
P0.7:0
P3.7
P3.6
D8
0
-
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