Datasheet

TMS320LF2407A,TMS320LF2406A,TMS320LF2403A,TMS320LF2402A
TMS320LC2406A,TMS320LC2404A,TMS320LC2403A,TMS320LC2402A
DSP CONTROLLERS
SPRS145L − JULY 2000 − REVISED SEPTEMBER 2007
66
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
watchdog (WD) timer module (continued)
55 + AA
Detector
System
Reset
Request
WDCNTR.7 −0
6-Bit
Free-
Running
Counter
/64
/32
/16
/8
/4
/2
111
110
101
100
011
010
001
000
WDCLK
System
Reset
System Reset
CLR
Watchdog
Reset Key
Register
8-Bit Watchdog
Counter
CLR
Bad WDCR Key
Good Key
Bad Key
WDPS
WDCR.2 −0
210
WDKEY.7−0
WDCHK2−0
WDCR.5 −3
†
WDCR.7
WDFLAG
Reset Flag
PS/257
WDDIS
WDCR.6
101
(Constant
Value)
3
3
On-Chip
Oscillator or
External
Clock
÷ 512 PLL
CLKOUT CLKIN
3-bit
Prescaler
Internal
Pullup
RS Pin
One-Cycle
Delay
†
Writing to bits WDCR.5−3 with anything but the correct pattern (101) generates a system reset.
Figure 19. Block Diagram of the WD Module