AT80C51SND1C-ROTIL Atmel, AT80C51SND1C-ROTIL Datasheet - Page 135
AT80C51SND1C-ROTIL
Manufacturer Part Number
AT80C51SND1C-ROTIL
Description
IC MCU FLASH MP3 DECODER 80-TQFP
Manufacturer
Atmel
Series
80Cr
Datasheet
1.AT80C51SND1C-ROTIL.pdf
(213 pages)
Specifications of AT80C51SND1C-ROTIL
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 Type
ROMless
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.3 V
Data Converters
A/D 2x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TQFP, 80-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Other names
AT80C51SND1CROTIL
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18.2.2
18.3
4109L–8051–02/08
Synchronous Mode (Mode 0)
Internal Baud Rate Generator
Figure 18-1. Timer 1 Baud Rate Generator Block Diagram
When using the Internal Baud Rate Generator, the Baud Rate is derived from the overflow of the
timer. As shown in Figure 18-2 the Internal Baud Rate Generator is an 8-bit auto-reload timer
fed by the peripheral clock or by the peripheral clock divided by 6 depending on the SPD bit in
BDRCON register (see Table 130). The Internal Baud Rate Generator is enabled by setting BBR
bit in BDRCON register. SMOD1 bit in PCON register allows doubling of the generated baud
rate.
Figure 18-2. Internal Baud Rate Generator Block Diagram
Mode 0 is a half-duplex, synchronous mode, which is commonly used to expand the I/0 capabil-
ities of a device with shift registers. The transmit data (TXD) pin outputs a set of eight clock
pulses while the receive data (RXD) pin transmits or receives a Byte of data. The 8-bit data are
transmitted and received least-significant bit (LSB) first. Shifts occur at a fixed Baud Rate (see
Section "Baud Rate Selection (Mode 0)", page 137). Figure 18-3 shows the serial port block dia-
gram in Mode 0.
CLOCK
CLOCK
INT1
PER
PER
T1
GATE1
TMOD.7
TCON.6
TR1
÷ 6
÷ 6
BDRCON.1
SPD
TMOD.6
C/T1#
0
1
0
1
BDRCON.4
BRR
(8 bits)
(8 bits)
(8 bits)
(8 bits)
BRG
BRL
TH1
TL1
Overflow
Overflow
AT8xC51SND1C
÷ 2
÷ 2
SMOD1
SMOD1
PCON.7
CLOCK
PCON.7
CLOCK
IBRG
T1
0
1
0
1
To serial
Port
To serial
Port
135
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