C8051F961-A-GM Silicon Labs, C8051F961-A-GM Datasheet - Page 340

• Manufacturer Part Number: C8051F961-A-GM
• Description: 8-bit Microcontrollers - MCU 128KB, DC-DC, LCD AES, QFN40
• Manufacturer: Silicon Labs

Specifications of C8051F961-A-GM

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8448 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.5 V to 3.3 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFN-40
• Mounting Style: SMD/SMT
• Number Of Programmable I/os: 34
• Number Of Timers: 4

C8051F96x
26.3.4. Contrast Control Mode 4 (Auto-Bypass Mode)
In Contrast Control Mode 4, behavior is identical to Constant Contrast Mode as long as VBAT is greater
than the VBAT monitor threshold voltage. When VBAT drops below the programmed threshold, the device
automatically enters bypass mode powering VLCD directly from VBAT. The charge pump is always dis-
abled in this mode. Auto-Bypass Mode is selected using the following procedure:
340
1. Set Bit 2 of the LCD0MSCN register to 1b (LCD0MSCN |= 0x04)
2. Clear Bit 0 of the LCD0MSCF register to 0b (LCD0MSCF &= ~0x01)
3. Clear Bit 3 of the LCD0PWR register to 0b (LCD0PWR &= ~0x08)
4. Set Bit 7 of the LCD0VBMCN register to 1b (LCD0VBMCN |= 0x80)
V B A T
V L C D
Figure 26.6. Contrast Control Mode 4
Rev. 0.5