UPSD3234AV-24U1T STMicroelectronics, UPSD3234AV-24U1T Datasheet - Page 40

• Manufacturer Part Number: UPSD3234AV-24U1T
• Description: Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
• Manufacturer: STMicroelectronics

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uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
POWER-SAVING MODE
Two software selectable modes of reduced power
consumption are implemented.
Idle Mode
The following Functions are Switched Off.
The following Function Remain Active During Idle
Mode.
Table 25. Power-Saving Mode Power Consumption
Power Control Register
The Idle and Power-down Modes are activated by software via the PCON register.
Table 26. Pin Status During Idle and Power-down Mode
Table 27. Description of the PCON Bits
Note: 1. See the T2CON register for details of the flag description
40/170
Addr
SFR
Power-down
87
Mode
CPU (Halted)
External Interrupts
Timer 0, Timer 1, Timer 2
DDC Interface
PWM Units
USB Interface
Idle
Bit
7
6
5
4
3
2
1
0
PCON
Name
Reg
ADSFINT
RCLK1
TCLK1
Symbol
SMOD1
LVREN
Maintain Data
Maintain Data
SMOD
SMOD
Addr/Data
IDL
PD
7
(1)
(1)
SMOD1 LVREN ADSFINT RCLK1
Double baud data rate bit UART
Double baud data rate bit 2nd UART
LVR disable bit (active High)
Enable ADC Interrupt
Received clock flag (UART 2)
Transmit clock flag (UART 2)
Activate Power-down Mode (High enable)
Activate Idle Mode (High enable)
6
Maintain Data
Maintain Data
Ports1,3,4
5
Bit Register Name
4
Note: Interrupt or RESET terminates the Idle
Mode.
Power-Down Mode
Note: The only way to exit Power-down Mode is a
RESET.
Disable
3
Active
PWM
USART
8-bit ADC
I
System Clock Halted
LVD Logic Remains Active
SRAM contents remains unchanged
The SFRs retain their value until a RESET is
asserted
2
C Interface
Function
TCLK1
2
Disable
Active
I
2
C
PD
1
IDLE
Disable
0
Active
DDC
Reset
Value
00
Comments
Power Ctrl
Disable
Active
USB