AT80C51SND1C-ROTIL Atmel, AT80C51SND1C-ROTIL Datasheet - Page 55

• Manufacturer Part Number: AT80C51SND1C-ROTIL
• Description: IC MCU FLASH MP3 DECODER 80-TQFP
• Manufacturer: Atmel
• Series: 80Cr

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

Figure 11-3. Mode 0 Overflow Period Formula
11.3.2
Figure 11-4. Timer/Counter x (x = 0 or 1) in Mode 1
Figure 11-5. Mode 1 Overflow Period Formula
11.3.3
Figure 11-6. Timer/Counter x (x = 0 or 1) in Mode 2
Figure 11-7. Mode 2 Autoreload Period Formula
4109L–8051–02/08
Mode 1 (16-bit Timer)
Mode 2 (8-bit Timer with Auto-Reload)
INTx
INTx
CLOCK
CLOCK
TIMx
TIMx
Tx
Tx
TMOD Reg
TMOD reg
GATEx
GATEx
÷ 6
÷ 6
Mode 1 configures Timer 0 as a 16-bit Timer with TH0 and TL0 registers connected in cascade
(see Figure 11-4). The selected input increments TL0 register. Figure 11-5 gives the overflow
period calculation formula when in timer mode.
Mode 2 configures Timer 0 as an 8-bit Timer (TL0 register) that automatically reloads from TH0
register (see Table 63). TL0 overflow sets TF0 flag in TCON register and reloads TL0 with the
contents of TH0, which is preset by software. When the interrupt request is serviced, hardware
clears TF0. The reload leaves TH0 unchanged. The next reload value may be changed at any
time by writing it to TH0 register. Figure 11-7 gives the autoreload period calculation formula
when in timer mode.
TMOD Reg
TMOD reg
C/Tx#
C/Tx#
0
1
0
1
TCON Reg
TCON reg
TFx
TRx
TRx
PER
=
TFx
6 ⋅
PER
(16384 – (THx, TLx))
TFx
=
PER
F
6
TIMx
=
⋅
(65536 – (THx, TLx))
6
⋅
(256 – THx)
F
F
(8 bits)
TIMx
TIMx
THx
(8 bits)
(8 bits)
THx
TLx
(8 bits)
TLx
Overflow
Overflow
TCON Reg
TCON reg
AT8xC51SND1C
TFx
TFx
Timer x
Interrupt
Request
Timer x
Interrupt
Request
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