VRS51C1100-40-Q Cypress Semiconductor, VRS51C1100-40-Q Datasheet - Page 29

• Manufacturer Part Number: VRS51C1100-40-Q
• Description: 8-bit Microcontrollers - MCU 128K+1K 40MHz 5V
• Manufacturer: Cypress Semiconductor

Specifications of VRS51C1100-40-Q

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 40 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 1 KB
• Operating Supply Voltage: 4.5 V to 5.5 V
• Package / Case: QFP-44
• Mounting Style: SMD/SMT
• Data Rom Size: 128 B
• Interface Type: UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Program Memory Type: Flash
• Factory Pack Quantity: 96
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V

VRS51C1100
The following formula can be used to calculate the
baud rate in modes 1 and 3 using Timer 2:
Modes 1, 3 Baud Rate =
Oscillator Frequency
32x[65536 – (RCAP2H, RCAP2L)]
The formula below is used to define the reload value
written into the RCAP2h, RCAP2L registers to achieve
a given baud rate.
(RCAP2H, RCAP2L) = 65536 -
Fosc
32x[Baud Rate]
In the above formula, RCAP2H and RCAP2L are the
contents of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer. Note that a rollover in TH2 does not
set TF2 and will not generate an interrupt. As such, the
Timer 2 interrupt does not have to be disabled when
Timer 2 is configured in baud rate generator mode.
Furthermore, when Timer 2 is configured as a UART
baud rate generator and is running (TR2 is set to 1),
the user should not try to perform read or write
operations to the TH2/TL2, RCAP2H and RCAP2L
registers.
______________________________________________________________________________________________
www.ramtron.com
page 29 of 50