C8051F021 Silicon Laboratories Inc, C8051F021 Datasheet - Page 174

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C8051F021

Manufacturer Part Number
C8051F021
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F02xr
Datasheets

Specifications of C8051F021

Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
32
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x8b, 8x12b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-

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C8051F020/1/2/3
174
Bits7-0:
Notes:
1.
2.
Bits7-0:
P1.7
R/W
R/W
Bit7
Bit7
P1.[7:0]: Port1 Output Latch Bits.
(Write - Output appears on I/O pins per XBR0, XBR1, XBR2, and XBR3 Registers)
0: Logic Low Output.
1: Logic High Output (open if corresponding P1MDOUT.n bit = 0).
(Read - Regardless of XBR0, XBR1, XBR2, and XBR3 Register settings).
0: P1.n pin is logic low.
1: P1.n pin is logic high.
P1.[7:0] can be configured as inputs to ADC1 as AIN1.[7:0], in which case they are ‘skipped’ by the
Crossbar assignment process and their digital input paths are disabled, depending on P1MDIN (See
Figure 17.13). Note that in analog mode, the output mode of the pin is determined by the Port 1 latch
and P1MDOUT (Figure 17.14). See
tion about ADC1.
P1.[7:0] can be driven by the External Data Memory Interface (as Address[15:8] in Non-multiplexed
mode). See
on page 145
P1MDIN.[7:0]: Port 1 Input Mode Bits.
0: Port Pin is configured in Analog Input mode. The digital input path is disabled (a read from the
Port bit will always return ‘0’). The weak pull-up on the pin is disabled.
1: Port Pin is configured in Digital Input mode. A read from the Port bit will return the logic level at
the Pin. The state of the weak pull-up is determined by the WEAKPUD bit (XBR2.7, see
Figure 17.9).
P1.6
R/W
R/W
Bit6
Bit6
Section “16. EXTERNAL DATA MEMORY INTERFACE AND ON-CHIP XRAM”
Figure 17.13. P1MDIN: Port1 Input Mode Register
for more information about the External Memory Interface.
P1.5
R/W
R/W
Bit5
Bit5
Figure 17.12. P1: Port1 Data Register
P1.4
R/W
R/W
Bit4
Bit4
Section “7. ADC1 (8-Bit ADC)” on page 75
Rev. 1.4
P1.3
R/W
R/W
Bit3
Bit3
P1.2
R/W
R/W
Bit2
Bit2
P1.1
R/W
R/W
Bit1
Bit1
(bit addressable)
P1.0
R/W
R/W
Bit0
Bit0
for more informa-
SFR Address:
SFR Address:
Reset Value
11111111
Reset Value
11111111
0xBD
0x90

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