VRS51C1100-40-Q-ISPV2 Cypress Semiconductor, VRS51C1100-40-Q-ISPV2 Datasheet - Page 13

• Manufacturer Part Number: VRS51C1100-40-Q-ISPV2
• Description: 8-bit Microcontrollers - MCU 128K+1K 40MHz 5V
• Manufacturer: Cypress Semiconductor

Specifications of VRS51C1100-40-Q-ISPV2

• 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

Power Control Register
The VRS51C1100 provides two power saving modes:
Idle and Power Down, which are controlled by the
PDOWN and IDLE bits of the PCON register at
address 87h.
T
In Idle mode, the processor is stopped but the oscillator
continues to run. The content of the RAM, I/O state and
SFR registers are maintained and the Timer and
external interrupts are left operational. The processor
will be woken up when an external event, triggering an
interrupt, occurs.
In Power Down mode, the oscillator and the
peripherals are disabled. The contents of the RAM and
the SFR registers, however, are maintained. The only
way to exit from the Power Down mode is via a
hardware reset (note that the watchdog timer is
stopped in Power Down).
When the VRS51C1100 is in Power Down, its current
consumption drops to about 50uA.
The SMOD bit of the PCON register controls the
oscillator divisor applied to Timer 1 when used as a
baud rate generator for the UART. Setting this bit to 1
doubles the UART’s baud rate generator frequency.
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ABLE
Bit
7
6
5
4
3
2
1
0
VRS51C1100
7
16: P
Mnemonic
SMOD
GF1
GF0
PDOWN
IDLE
OWER
6
C
ONTROL
5
Unused
R
Description
1: Double the baud rate of the serial port
frequency that was generated by Timer 1.
0: Normal serial port baud rate generated by
Timer 1.
General Purpose Flag
General Purpose Flag
Power Down mode control bit
Idle mode control bit
EGISTER
4
(PCON) - SFR 87
3
2
H
RAMS1
1
RAMS0
0
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