Silicon Laboratories C8051F340 Bedienungsanleitung Seite 157
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Rev. 0.5 157
C8051F340/1/2/3/4/5/6/7
SFR Definition 15.11. P1SKIP: Port1 Skip
SFR Definition 15.12. P2: Port2 Latch
SFR Definition 15.13. P2MDIN: Port2 Input Mode
Bits7–0: P1SKIP[7:0]: Port1 Crossbar Skip Enable Bits.
These bits select Port pins to be skipped by the Crossbar Decoder. Port pins used as ana-
log inputs (for ADC or Comparator) or used as special functions (VREF input, external oscil-
lator circuit, CNVSTR input) should be skipped by the Crossbar.
0: Corresponding P1.n pin is not skipped by the Crossbar.
1: Corresponding P1.n pin is skipped by the Crossbar.
R/W R/W R/W R/W R/W R/W R/W R/W Reset Value
00000000
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:
0xD5
Bits7–0: P2.[7:0]
Write - Output appears on I/O pins per Crossbar Registers (when XBARE = ‘1’).
0: Logic Low Output.
1: Logic High Output (high impedance if corresponding P2MDOUT.n bit = 0).
Read - Always reads ‘0’ if selected as analog input in register P2MDIN. Directly reads Port
pin when configured as digital input.
0: P2.n pin is logic low.
1: P2.n pin is logic high.
R/W R/W R/W R/W R/W R/W R/W R/W Reset Value
P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 11111111
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:
(bit addressable)
0xA0
Bits7-0: Analog Input Configuration Bits for P2.7-P2.0 (respectively).
Port pins configured as analog inputs have their weak pull-up, digital driver, and digital
receiver disabled.
0: Corresponding P2.n pin is configured as an analog input.
1: Corresponding P2.n pin is not configured as an analog input.
R/W R/W R/W R/W R/W R/W R/W R/W Reset Value
11111111
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:
0xF3
- C8051F340/1/2/3/4/5/6/7 1
- Rev. 0.5 19 19
- 20 Rev. 0.5 20
- 1.1.1. Fully 8051 Compatible 21
- 1.1.2. Improved Throughput 21
- 1.1.3. Additional Features 21
- Microcontroller 22
- C8051F340/1/4/5 36
- Top View 36
- 5.3.1. Starting a Conversion 45
- 5.3.2. Tracking Modes 46
- 9.2.1. Program Memory 79
- 9.2.2. Data Memory 80
- 9.2.5. Stack 80
- 9.2.7. Register Descriptions 85
- 9.3.2. External Interrupts 87
- 9.3.3. Interrupt Priorities 88
- 9.3.4. Interrupt Latency 88
- 9.4.1. Idle Mode 96
- 9.4.2. Stop Mode 96
- 12.1.2. Flash Erase Procedure 109
- 12.1.3. Flash Write Procedure 110
- 13.1.1. 16-Bit MOVX Example 117
- 13.1.2. 8-Bit MOVX Example 117
- 13.6.1. Internal XRAM Only 124
- 13.6.4. External Only 125
- 13.7.1. Non-multiplexed Mode 127
- 13.7.2. Multiplexed Mode 130
- 14.3.3. External RC Example 140
- 14.5.2. USB Clock Selection 143
- 16.5.1. FIFO Split Mode 171
- 16.5.2. FIFO Double Buffering 172
- 16.5.1. FIFO Access 172
- 17.3.1. Arbitration 195
- 17.3.2. Clock Low Extension 196
- 17.3.3. SCL Low Timeout 196
- 17.4.3. Data Register 204
- 17.5.2. Master Receiver Mode 206
- 17.5.3. Slave Receiver Mode 207
- 18.2.1. 8-Bit UART 213
- 18.2.2. 9-Bit UART 214
- 19.3.1. Data Transmission 222
- 19.3.2. Data Reception 222
- 20.1.3. Serial Clock (SCK) 230
- 20.1.4. Slave Select (NSS) 230
- 266 Rev. 0.5 266
- Rev. 0.5 267 267
- 268 Rev. 0.5 268
- 22.2.4. Frequency Output Mode 269
- 270 Rev. 0.5 270
- Rev. 0.5 271 271
- WDT updates are performed 272
- PCA clocks) by 272
- 22.3.2. Watchdog Timer Usage 273
- 23.2. C2 Pin Sharing 281
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