FM33256/FM3316 SPI Companion w/ FRAM
to operate in polled mode. When POLL=0, CNT pin is continuously active. Nonvolatile, read/write.
The CNT pin detects falling edges when CP = 0, rising edges when CP = 1. Nonvolatile, read/write.
CP
0Ch
Watchdog Control
D7
D6
D5
D4
D3
D2
D1
D0
WDE
-
-
WDET4
WDET3
WDET2
WDET1
WDET0
WDE
Watchdog Enable: When WDE=1, a watchdog timer fault will cause the /RST signal to go active. When WDE =
0 the timer runs but has no effect on the /RST pin. Nonvolatile, read/write.
WDET(4:0) Watchdog EndTime: Sets the ending time for the watchdog window timer with 60 ms (min.) resolution. The
window timer allow independent leading and trailing edges (start and end of window) to be set. New watchdog
timeouts are loaded when the timer is restarted by writing the 1010b pattern to WR(3:0). To save power (disable
timer circuit), the EndTime may be set to all zeroes. Nonvolatile, read/write.
Watchdog EndTime
Disables Timer
WDET4 WDET3 WDET2 WDET1 WDET0
0
0
0
0
0
(min.)
60 ms
120 ms
(max.)
200 ms
400 ms
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
180 ms
600 ms
.
.
.
.
.
.
1200 ms
1260 ms
4000 ms
4200 ms
1
1
1
0
0
0
1
1
1
0
0
1
0
1
0
1320 ms
4400 ms
.
.
.
.
.
.
1740 ms
1800 ms
1860 ms
5800 ms
6000 ms
6200 ms
1
1
1
1
1
1
1
1
1
0
1
1
1
0
1
0Bh
Watchdog Control
D7
D6
D5
D4
D3
WDST3
D2
WDST2
D1
D0
-
-
-
WDST4
WDST1
WDST0
WDST(4:0) Watchdog StartTime. Sets the starting time for the watchdog window timer with 25 ms (max.) resolution. The
window timer allow independent leading and trailing edges (start and end of window) to be set. New watchdog
timer settings are loaded when the timer is restarted by writing the 1010b pattern to WR(3:0). Nonvolatile,
read/write.
Watchdog StartTime
0 ms (default)
WDST4 WDST3 WDST2 WDST1 WDST0
0
0
0
0
0
(min.)
7.5 ms
15.0 ms
(max.)
25 ms
50 ms
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
22.5 ms
75 ms
.
.
.
.
.
.
150 ms
157.5 ms
500 ms
525 ms
1
1
1
0
0
0
1
1
1
0
0
1
0
1
0
165 ms
550 ms
.
.
.
.
.
.
217.5 ms
225 ms
232.5 ms
725 ms
750 ms
775 ms
1
1
1
1
1
1
1
1
1
0
1
1
1
0
1
0Ah
Watchdog Restart
D7
D6
D5
D4
D3
D2
WR2
D1
D0
-
-
-
-
WR3
WR1
WR0
WR(3:0)
Watchdog Restart. Writing a pattern 1010b to WR(3:0) restarts the watchdog timer. The upper nibble contents
do not affect this operation. Writing any pattern other than 1010b to WR3-0 has no effect on the watchdog.
Write-only.
Rev. 1.0
Dec. 2006
Page 15 of 28
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
