C8051F961-A-GM Silicon Labs, C8051F961-A-GM Datasheet - Page 322

• 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
SFR Definition 25.2. PC0PCF: PC0 Mode Pull-Up Configuration
SFR Address = 0xD7; SFR Page = 0x2
322
Name
Reset
4:2
1:0
Bit
Type
7
6
5
Bit
PUCAL
R/W
CALPORT
DUTY[1:0]
CALRES
RES[2:0]
7
0
PUCAL
Name
CALRES
R
6
1
Pull-Up Driver Calibration
0: Calibration complete or not running.
1: Start calibration of pull up (Self clearing). 
Calibration determines the lowest usable pull-up strength.
Calibration Result
0: Fail (switch may be closed preventing detection of pull ups). 
Writes value of 0x11111 to PC0PCF[4:0]
1: Pass (writes calibrated value into PC0PCF[4:0]).
Calibration Port
0: Calibration on PC0 only.
1: Calibration on PC1 only.
Pull-Up Resistor Select
Current with force pull-up on bit set (PC0TH.2=1) and VBAT=3.6V.
000: Pull-up disabled.
001: 1 A.*
010: 4 A.*
011: 16 A.*
100: 64 A.*
101: 256 A.*
110: 1 mA.*
111: 4 mA.*
*The effective average pull-up current depends on selected resistor, pull-up
resistor duty-cycle multiplier, and sample rate duty-cycle multiplier.
Pull-Up Resistor Duty Cycle Multiplier
000: 1/4 (25%)*
001: 3/8 (37.5%)*
010: 1/2 (50%)*
011: 3/4 (75%)*
*The final pull-up resistor duty cycle is the sample rate duty-cycle multiplier
times the pull-up duty-cycle multiplier.
CALPORT
R/W
5
0
R/W
Rev. 0.5
4
0
RES[2:0]
R/W
3
0
Function
R/W
2
1
R/W
1
0
DUTY[1:0]
R/W
0
0