TCC76x
Specification Rev. 0.07
February 23, 2005
32-bit RISC Microprocessor for Digital Media Player
TIMER / COUNTER
Preliminary
6-1
6 TIMER / COUNTER
6.1 Overview
The TCC76x has four 16bit and two 20bit timer/counters. Each timer counter has three
registers for basic operation modes. Refer to register description table for details. When
operating in counter modes, External interrupt pin is used as counting clock for that
counter.
The main clock frequency of timer counter can be configured by setting TCLK frequency.
(Refer to Clock generator block) With the 12bit internal basic counter, the timer counter
can generate various intervals from microseconds to seconds unit.
In addition to TCC72x compatible timers/counters, the TCC76x provides a 32-bit
general-purpose up counter. (Refer to Figure 6.3).
The following figure represents the block diagram of timer/counter.
Counter
Clock
Selector
Basic
Counter
pi_EXTCK<3:0>
TCFG
TCNT
TREF
Compare
(=)
Tgl
TREQ
TCO
TMREF
external clock source through the
noise filter of interrupt controller
Compare
(=)
TCLK
Figure 6.1 Timer Counter Block Diagram
The following table explains the registers of each timer counter. The address of each timer
counter is 16bytes aligned. The base address of timer counter is 0x80000200.
The number n represents for each timer/counter. In case of timer/counter 4, 5 (that is n = 4
or 5) the TREF, TCNT register has 20bit resolution. It can be used for generating long
time of event.
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