AT89C51SND1C-ROTIL ATMEL Corporation, AT89C51SND1C-ROTIL Datasheet - Page 10

• Manufacturer Part Number: AT89C51SND1C-ROTIL
• Description: Single-Chip Microcontroller with MP3 Decoder and Man-Machine Interface
• Manufacturer: ATMEL Corporation

Internal Pin Structure
Table 15. Detailed Internal Pin Structure
Notes:
10
1. For information on resistors value, input/output levels, and drive capability, refer to the Section “DC Characteristics”,
2. When the TWI controller is enabled, P
3. In Port 2, P
Latch Output
AT8xC51SND1C
page 24.
Watchdog Output
1
transistor is continuously driven when outputting a high level bit address (A15:8).
periods
2 osc
V
DD
Circuit
P
V
VSS
N
1
DD
VSS
V
P
V
VSS
P
N
V
VSS
DD
P
N
DD
DD
(1)
P
V
1
2
DD
, P
2
, and P
D+
D-
P
V
3
DD
3
transistors are disabled allowing pseudo open-drain structure.
Input/Output
Input/Output
Input/Output
Input/Output
Output
Type
Input
4106F–8051–10/02
MCMD
DOUT
MDAT
DCLK
MCLK
P53:0
SCLK
DSEL
Pins
TST
P1
P2
RST
ALE
ISP
D+
P3
P4
P0
D-
(2)
(3)