C8051F120DK Silicon Laboratories Inc, C8051F120DK Datasheet - Page 325

• Manufacturer Part Number: C8051F120DK
• Description: DEVKIT-F120/21/22/23/24/25/26/27
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F120DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F12x and C8051F13x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F120
• Silicon Family Name: C8051F12x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F120, 121, 122, 123, 124, 125, 126, 127
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1224

24. Programmable Counter Array
The Programmable Counter Array (PCA0) provides enhanced timer functionality while requiring less CPU
intervention than the standard 8051 counter/timers. PCA0 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 (See
through 3 and the Priority Crossbar Decoder” on page 238
mable timebase that can select between six inputs as its source: system clock, system clock divided by
four, system clock divided by twelve, the external oscillator clock source divided by 8, Timer 0 overflow, or
an external clock signal on the ECI line. Each capture/compare module may be configured to operate inde-
pendently in one of six modes: Edge-Triggered Capture, Software Timer, High-Speed Output, Frequency
Output, 8-Bit PWM, or 16-Bit PWM (each is described in
trolled through the system controller's Special Function Registers. The basic PCA block diagram is shown
in Figure 24.1.
Capture/Compare
Module 0
SYSCLK/12
SYSCLK/4
Timer 0 Overflow
ECI
SYSCLK
External Clock/8
Capture/Compare
Module 1
CLOCK
MUX
PCA
Figure 24.1. PCA Block Diagram
16-Bit Counter/Timer
Capture/Compare
Module 2
Crossbar
Port I/O
Rev. 1.4
C8051F120/1/2/3/4/5/6/7
Section 24.2
Capture/Compare
Module 3
). The counter/timer is driven by a program-
C8051F130/1/2/3
). The PCA is configured and con-
Capture/Compare
Module 4
Section “18.1. Ports 0
Capture/Compare
Module 5
325