C8051F988-GM Silicon Laboratories Inc, C8051F988-GM Datasheet - Page 298
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C8051F988-GM
Manufacturer Part Number
C8051F988-GM
Description
IC MCU 8BIT 4KB FLASH 24QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F9xxr
Specifications of C8051F988-GM
Program Memory Type
FLASH
Program Memory Size
4KB (4K x 8)
Package / Case
24-UQFN Exposed Pad, 24-HUQFN
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
17
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 10x10b
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
10 bit, 10 Channel
On-chip Dac
10 bit, 4 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1959-5
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C8051F99x-C8051F98x
26. Programmable Counter Array
The programmable counter array (PCA0) provides enhanced timer functionality while requiring less CPU
intervention than the standard 8051 counter/timers. The PCA consists of a dedicated 16-bit counter/timer
and three 16-bit capture/compare modules. Each capture/compare module has its own associated I/O line
(CEXn) which is routed through the Crossbar to Port I/O when enabled. The counter/timer is driven by a
programmable timebase that can select between six sources: system clock, system clock divided by four,
system clock divided by twelve, the external oscillator clock source divided by 8, SmaRTClock divided by
8, Timer 0 overflows, or an external clock signal on the ECI input pin. Each capture/compare module may
be configured to operate independently in one of six modes: Edge-Triggered Capture, Software Timer,
High-Speed Output, Frequency Output, 8 to 11-Bit PWM, or 16-Bit PWM (each mode is described in
Section “26.3. Capture/Compare Modules” on page 301). The external oscillator clock option is ideal for
real-time clock (RTC) functionality, allowing the PCA to be clocked by a precision external oscillator while
the internal oscillator drives the system clock. The PCA is configured and controlled through the system
controller's Special Function Registers. The PCA block diagram is shown in Figure 26.1
Important Note: The PCA Module 2 may be used as a watchdog timer (WDT), and is enabled in this mode
following a system reset. Access to certain PCA registers is restricted while WDT mode is enabled.
See Section 26.4 for details.
298
Capture/Compare
Figure 26.1. PCA Block Diagram
Module 0
SYSCLK/12
Timer 0 Overflow
SYSCLK
External Clock/8
SmaRTClock/8
SYSCLK/4
ECI
Crossbar
Port I/O
Rev. 1.0
Capture/Compare
Module 1
CLOCK
MUX
PCA
16-Bit Counter/Timer
Capture/Compare
Module 2 / WDT
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