AT89C5122D-RDRUM Atmel, AT89C5122D-RDRUM Datasheet - Page 132

• Manufacturer Part Number: AT89C5122D-RDRUM
• Description: IC 8051 MCU 32K CRAM USB 64-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-RDRUM

• 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: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-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: -
• Other names: AT89C5122D-RDRUMTR

Table 76. Internal Baud Rate Generator Value
Baud Rate Selection (Mode 2)
132
Baud Rate
Baud Rate
115200
115200
57600
38400
19200
57600
38400
19200
9600
4800
9600
4800
AT83R5122, AT8xC5122/23
SPD
SPD
1
1
1
1
1
1
1
1
1
1
1
1
SMOD1
SMOD1
F
F
CK_IDLE
CK_IDLE
1
1
1
1
1
1
1
1
1
1
1
1
= 12 MHz
= 4 MHz
BRL
BRL
254
252
249
243
249
243
236
217
230
204
178
100
In mode 2, the baud rate can only be programmed to two fixed values: 1/16 or 1/32 of
the peripheral clock frequency.
As shown in Figure 80 the selection is done using SMOD1 bit in PCON register.
Figure 81 gives the baud rate calculation formula depending on the selection.
Figure 80. Baud Rate Generator Selection (Mode 2)
Figure 81. Baud Rate Formula (Mode 2)
For mode 0 for UART, thanks to the bit M0SRC located in BDRCON register (Table 82)
Baud_Rate =
CK_
SI
Error%
Error%
8.51
8.51
6.99
0.16
0.16
0.16
6.99
0.16
2.34
0.16
0.16
0.16
SPD
SPD
2
SMOD1
1
1
1
1
1
1
1
1
1
1
1
1
32
x2
SMOD1
SMOD1
F
F
CK_SI
F
CK_IDLE
CK_IDLE
1
1
1
1
1
1
1
1
1
1
1
1
= 16 MHz
SMOD1
= 8 MHz
PCON.7
1
0
BRL
BRL
252
247
243
230
204
152
247
239
230
204
152
48
Error%
Error%
8.51
3.55
0.16
0.16
0.16
0.16
3.55
2.12
0.16
0.16
0.16
0.16
/32
SPD
SPD
1
1
1
1
1
1
1
1
1
1
1
1
To Serial Port
SMOD1
SMOD1
F
F
CK_IDLE
CK_IDLE
1
1
1
1
1
1
1
1
1
1
1
1
= 9.6 MHz
= 24 MHz
BRL
BRL
4202F–SCR–07/2008
251
246
240
225
194
131
243
230
217
178
100
N/A
Error%
Error%
4.17
4.17
2.34
0.81
0.81
0.00
0.16
0.16
0.16
0.16
0.16
N/A