C8051F966-A-GQ Silicon Labs, C8051F966-A-GQ Datasheet - Page 466

• Manufacturer Part Number: C8051F966-A-GQ
• Description: 8-bit Microcontrollers - MCU 32KB DC-DC LCD AES
• Manufacturer: Silicon Labs

Specifications of C8051F966-A-GQ

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 24.5 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 8 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.8 V to 3.8 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFP-80
• Mounting Style: SMD/SMT

C8051F96x
33. 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 six 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 seven 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 Sec-
tion “33.3. Capture/Compare Modules” on page 469). 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 con-
troller's Special Function Registers. The PCA block diagram is shown in Figure 33.1
Important Note: The PCA Module 5 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 33.4 for details.
466
Capture/Compare
Module 0
SYSCLK/12
SYSCLK/4
Timer 0 Overflow
SYSCLK
External Clock/8
SmaRTClock/8
ECI
Capture/Compare
Module 1
CLOCK
MUX
PCA
Figure 33.1. PCA Block Diagram
16-Bit Counter/Timer
Port I/O
Capture/Compare
Module 2
Crossbar
Rev. 0.5
Capture/Compare
Module 3
Capture/Compare
Module 4
Capture/Compare
Module 5 / WDT