TMS320VC5502 datasheet(70/189 Pages) TI

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TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004

Table 3-20. Oscillator Wakeup Control Register Bit Field Description (continued)

BIT NAME

BIT NO.

ACCESS

RESET VALUE

DESCRIPTION

WKEN0

R/W

Input NMI can wake up the oscillator when the OSCPWRDN bit in

PLLCSR is asserted to logic 1.

•

WKEN0 = 0:

Wake-up enabled. A low-to-high transition on NMI wakes up the

oscillator and clears the OSCPWRDN bit.

•

WKEN0 = 1:

Wake-up disabled. A low-to-high transition on NMI does not wake

up the oscillator.

3.10.5.9

CLKOUT3 Select Register (CK3SEL)

This register controls which clock is output onto the CLKOUT3 so that it may be used to test and debug

the PLL (in addition to its normal function of being a direct input clock divider). Modes other than

CK3SEL = 1011 are intended for debug use only and should not be used during normal operation.

Reserved

R, 00000000

Reserved

CK3SEL

R, 0000

R/W, 1011

LEGEND: R = Read, W = Write, n = value at reset

Figure 3-23. CLKOUT3 Select Register Layout (0x1C82)

Table 3-21. CLKOUT3 Select Register Bit Field Description

BIT NAME

BIT NO.

ACCESS

RESET VALUE

DESCRIPTION

Reserved

15:4

000000000000

Reserved. Reads return 0. Writes have no effect.

CK3SEL

3:0

R/W

1011

Output on CLK3SEL pin(1)

•

CK3SEL = 1001: CLKOUT3 becomes point A in Figure 3-14

•

CK3SEL = 1010: CLKOUT3 becomes point B in Figure 3-14

•

CK3SEL = 0000-0111: CLKOUT3 becomes oscillator divider output

in Figure 3-14

•

CK3SEL = 1011: CLKOUT3 becomes point C in Figure 3-14

•

CK3SEL = Other: Not supported

(1)

The different options for the CLKOUT3 signal are intended for test purposes; it is recommended that the CK3SEL bits of the CK3SEL

3.10.5.10

CLKOUT Selection Register (CLKOUTSR)

As described in Section 3.10.2, Clock Groups, the 5502 has different clock groups, each of which can be

driven by a clock that is different from the CPU clock. The CLKOUT Selection Register determines which

clock signal is reflected on the CLKOUT pin.

Functional Overview

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