W78E054D Datasheet, PDF (55/89 Pages) List of Unclassifed Manufacturers – 8-bit microcontroller

W78E054D/W78E052D Data Sheet
WIDL
IDLE
1/12
OSC
1/6
ENW
EXTERNAL
RESET
Pre-Scalar
14- BIT TIMER
CLEAR
INTERNAL
RESET
CLRW
Figure 15–1 Watchdog Timer Block Diagram
Typical Watch-Dog time-out period when OSC = 20 MHz
PS2 PS1 PS0
Watchdog time-out period
(for 12T per machine cycle)
0 00
19.66 mS
0 10
78.64 mS
0 01
39.32 mS
0 11
157.28 mS
1 00
314.57 mS
1 01
629.14 mS
1 10
1.25 S
1 11
2.50 S
Table 15–2 Watch-Dog time-out period for 12T per machine cycle, 20MHz
PS2 PS1 PS0
0 00
0 10
0 01
0 11
1 00
1 01
1 10
1 11
Watchdog time-out period
(for 6T per machine cycle)
9.83 mS
39.32 mS
19.66 mS
78.64 mS
157.28 mS
314.57mS
629.14 mS
1.250 S
Table 15–3 Watch-Dog time-out period for 6T per machine cycle, 20MHz
16 SERIAL PORT
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Publication Release Date: Jun 9, 2015
Revision A13