AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 147

• Manufacturer Part Number: AT89C5122D-PSTUM
• Description: IC 8051 MCU FLASH 32K 64QFN
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-PSTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: SmartCard, SPI, UART/USART, USB
• Peripherals: LED, POR, WDT
• Number Of I /o: 46
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFN
• For Use With: AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

Mode 2 (8-bit Timer with Auto-
Reload)
4202F–SCR–07/2008
INTx#
CK_Tx
INTx#
CK_Tx
Tx
Tx
TMOD reg
TMOD reg
GATEx
GATEx
/6
/6
Figure 91. Timer/Counter x (x = 0 or 1) in Mode 1
Figure 92. Mode 1 Overflow Period Formula
Mode 2 configures Timer 0 as an 8-bit Timer (TL0 register) that automatically reloads
from the TH0 register (see Figure 93). TL0 overflow sets the TF0 flag in the TCON reg-
ister and reloads TL0 with the contents of TH0, which is preset by the software. When
the interrupt request is serviced, the hardware clears TF0. The reload leaves TH0
unchanged. The next reload value may be changed at any time by writing it to the TH0
register.
Figure 94 gives the autoreload period calculation formula when in timer mode.
Figure 93. Timer/Counter x (x = 0 or 1) in Mode 2
Figure 94. Mode 2 Autoreload Period Formula
TFx
TFx
TMOD reg
PER
PER
C/Tx#
=
=
0
1
TCON reg
TCON reg
6 (256 – THx)
6
TRx
TRx
(65536 – (THx, TLx))
F
CK_Tx
TMOD reg
C/Tx#
F
0
1
CK_Tx
AT83R5122, AT8xC5122/23
(8 bits)
THx
(8 bits)
(8 bits)
THx
TLx
(8 bits)
TLx
Overflow
Overflow
TCON reg
TCON reg
TFx
TFx
Timer x
Interrupt
Request
Timer x
Interrupt
Request
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