at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 14

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

MMI Interface
Power Management
14
AT85C51SND3B
Table 13. Keypad Controller Signal Description
Table 14. LCD Interface Signal Description
Table 15. Power Signal Description
LWR/LRW
LRD/LDE
LA0/LRS
DCPWR
Signal
Signal
KIN3:0
Signal
Signal
Name
Name
Name
LD7:0
Name
BVDD
DCLI
TXD
RTS
CTS
LCS
Type Description
Type Description
Type Description
Type Description
PWR
PWR
I/O
O
O
O
O
O
O
I
I
I
Transmit Serial Data
TXD outputs the shift clock in serial I/O mode 0 and transmits data in
serial I/O modes 1, 2 and 3.
Request To Send Hardware Handshake Line
Asserted low by hardware when SIO is ready to receive data.
Clear To Send Hardware Handshake Line
Asserted low by external hardware when SIO is allowed to send data.
Keypad Input lines
Holding one of these pins high or low for 24 oscillator periods triggers a
keypad interrupt.
Display Data Bus
8-bit bidirectional data bus.
Read Signal/Enable Signal
8080:
6800:
Write Signal/Read Write Signal
8080:
6800:
Display Chip Select
Select signal asserted low during display access.
Display Address Bit 0/Register Select
Address signal asserted during display access.
DC-DC Power ON Input
Connect DCPWR to V
DC-DC Inductance Input
Connect low ESR inductance to DCLI and BVDD.
Battery Supply Voltage
Connect this pin to the positive pin of the battery.
Read signal asserted low during display read access.
Enable signal asserted high during display access.
Write signal asserted low during display write access.
Read/Write signal asserted low/high during display read/write
access
SS
to start the DC-DC converter.
7632C–MP3–11/06
Alternate
Function
Alternate
Function
Alternate
Function
Alternate
Function
P1.3:0
P0.7:0
SD7:0
MOSI
SWR
INT0
INT1
P3.1
P3.2
SCK
P3.3
P5.0
SRD
P5.3
P5.1
SCS
P5.2
SA0
SS
-
-