TCC76 Datasheet, PDF (95/259 Pages) List of Unclassifed Manufacturers – 32-bit RISC Microprocessor For Digital Media Player

TCC76x
Specification Rev. 0.07
32-bit RISC Microprocessor for Digital Media Player
February 23, 2005
TIMER / COUNTER
As illustrated in the figure below, TC32 consists of a pre-scale counter, main counter and two
comparators. The pre-scale counter is a simple 24-bit up-counter which always counts from zero to
PRESCALE value programmed in TC32EN register. The 32-bit main counter is incremented only
when the prescale counter reaches PRESCALE value.
The clock input of TC32 module can be either XTIN (default) or XIN. Refer to Clock Generator
description (XTTC32 bit of PWDCTL register).
TC32EN
ZCLK from Clock Controller
(XTIN or XIN)
Pre-scale
Counter
TC32LDV
TC32CMP0
TC32CMP1
TC32IRQ
Main
Counter
Compare
(=)
Compare
(=)
IRQ
Sync.
IRQ to
Interrupt
Controller
Figure 6.3 32-bit Counter Block Diagram
Possible counter modes are described in the table below.
Table 6.2 TC32 Count Mode
TC32EN Register Bits
Main Counter Operation
Mode
LOADZERO LDM1 LDM0 Start Count Value End Count Value
0
0
0
0 LOADVAL
0xFFFFFFFF
1
0
0
1 LOADVAL
CMP0 (if LOADVAL < CMP0)
2
0
1
0 LOADVAL
CMP1 (if LOADVAL < CMP1)
3
0
1
1 LOADVAL
CMP0 (if LOADVAL < CMP0 ≤ CMP1) or
CMP1 (if LOADVAL < CMP1 ≤ CMP0)
4
1
0
00
LOADVAL – 1
5
1
0
10
CMP0 (if LOADVAL > CMP0)
6
1
1
00
CMP1 (if LOADVAL > CMP1)
7
1
1
10
CMP0 (if LOADVAL > CMP1 ≥ CMP0) or
CMP1 (if LOADVAL > CMP0 ≥ CMP1)
Refer to register descriptions below for CMP0, CMP1 and LOADVAL.
Mode0 can be used as 1Hz counter mode, if PRESCALE = 0x007FFF, STOPMODE = 0, ZCLK = XTIN(32.768kHz)
Preliminary
6-7