AT89C5122D-RDRIM Atmel, AT89C5122D-RDRIM Datasheet - Page 131
![IC MCU 80C51 W/SMART CARD 64VQFP](/photos/6/81/68127/313-64-vqfp_sml.jpg)
AT89C5122D-RDRIM
Manufacturer Part Number
AT89C5122D-RDRIM
Description
IC MCU 80C51 W/SMART CARD 64VQFP
Manufacturer
Atmel
Series
89Cr
Specifications of AT89C5122D-RDRIM
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-TQFP, 64-VQFP
For Use With
AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
AT89C5122DRDRIMTR
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Baud Rate Selection
(Modes 1 and 3)
4202F–SCR–07/2008
CLOCK
CLOCK
IBRG
T1
BDRCON.2
RBCK
In modes 1 and 3, the Baud Rate is derived either from the Timer 1 or the Internal Baud
Rate Generator and allows different baud rate in reception and transmission.
As shown in Figure 78 the selection is done using RBCK and TBCK bits in BDRCON
register.
Figure 79 gives the baud rate calculation formulas for each baud rate source while
Table 76 details Internal Baud Rate Generator configuration for different peripheral
clock frequencies and giving baud rates closer to the standard baud rates.
Figure 78. Baud Rate Source Selection (Modes 1 and 3)
Figure 79. Baud Rate Formulas (Modes 1 and 3)
0
1
Baud_Rate =
BRL = 256 -
/ 16
a. IBRG Formula
6
6
(1-SPD)
(1-SPD)
2
2
To serial
reception Port
SMOD1
SMOD1
32 (256 -BRL)
32 Baud_Rate
F
F
CK_SI
CK_SI
AT83R5122, AT8xC5122/23
CLOCK
CLOCK
IBRG
T1
BDRCON.3
TBCK
0
1
Baud_Rate =
TH1 = 256 -
/ 16
b. T1 Formula
192 Baud_Rate
192 (256 -TH1)
2
2
To serial
transmission Port
SMOD1
SMOD1
F
F
CK_T1
CK_T1
131
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