C8051F987-GU Silicon Laboratories Inc, C8051F987-GU Datasheet - Page 216
C8051F987-GU
Manufacturer Part Number
C8051F987-GU
Description
IC MCU 8BIT 8KB FLASH 24QSOP
Manufacturer
Silicon Laboratories Inc
Series
C8051F9xxr
Specifications of C8051F987-GU
Program Memory Type
FLASH
Program Memory Size
8KB (8K x 8)
Package / Case
24-QSOP
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
17
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F9x
Core
8051
Data Ram Size
512 B
Interface Type
I2C, SMBus, Enhanced UART, Enhanced SPI
Maximum Clock Frequency
7 KHz
Number Of Programmable I/os
17
Number Of Timers
4
Operating Supply Voltage
2.4 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F996DK
Minimum Operating Temperature
- 40 C
On-chip Adc
1 Analog Comparator
On-chip Dac
10 bit, 4 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1955-5
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21.2.2. Assigning Port I/O Pins to Digital Functions
Any Port pins not assigned to analog functions may be assigned to digital functions or used as GPIO. Most
digital functions rely on the Crossbar for pin assignment; however, some digital functions bypass the
Crossbar in a manner similar to the analog functions listed above. Port pins used by these digital func-
tions and any Port pins selected for use as GPIO should have their corresponding bit in PnSKIP set
to 1. Table 21.2 shows all available digital functions and the potential mapping of Port I/O to each digital
function.
21.2.3. Assigning Port I/O Pins to External Digital Event Capture Functions
External digital event capture functions can be used to trigger an interrupt or wake the device from a low
power mode when a transition occurs on a digital I/O pin. The digital event capture functions do not require
dedicated pins and will function on both GPIO pins (PnSKIP = 1) and pins in use by the Crossbar (PnSKIP
= 0). External digital even capture functions cannot be used on pins configured for analog I/O. Table 21.3
shows all available external digital event capture functions.
216
Digital Function
UART0, SPI0, SMBus, CP0
Outputs, System Clock Out-
put, PCA0, Timer0 and
Timer1 External Inputs.
Any pin used for GPIO
Digital Function
External Interrupt 0
External Interrupt 1
Port Match
Table 21.3. Port I/O Assignment for External Digital Event Capture Functions
Table 21.2. Port I/O Assignment for Digital Functions
Note: The Crossbar will always assign UART0
Crossbar. This includes P0.0–P1.7 pins which
Any Port pin available for assignment by the
Potentially Assignable Port Pins
Potentially Assignable Port Pins
and SPI1 pins to fixed locations.
have their PnSKIP bit set to 0.
P0.0–P1.7, P2.7
Rev. 1.0
P0.0–P0.7
P0.0–P0.7
P0.0–P1.7
XBR0, XBR1, XBR2
P0MASK, P0MAT
P1MASK, P1MAT
SFR(s) used for
P0SKIP, P1SKIP
SFR(s) used for
Assignment
Assignment
IT01CF
IT01CF
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