z86d73 ZiLOG Semiconductor, z86d73 Datasheet - Page 72

• Manufacturer Part Number: z86d73
• Description: 40/44/48-pin Low-voltage
• Manufacturer: ZiLOG Semiconductor

PS019402-1103
* CLR1 and CLR2 enable the WDT/POR and 18 Clock Reset timers upon a Low-to-High input translation.
From Stop
Select (SMR)
Recovery
VBO/VLV
Stop Delay
2V REF.
Source
Mode
V
WDT
DD
CK Source
(WDTMR)
XTAL
Select
12-ns Glitch Filter
+
-
Figure 39. Resets and WDT
WDTMR During STOP (D3)
This bit determines whether or not the WDT is active during STOP Mode.
Because the XTAL clock is stopped during STOP Mode, the on-board RC has to
be selected as the clock source to the WDT/POR counter. A 1 indicates active
during STOP. The default is 1.
Clock Source for WDT (D4)
This bit determines which oscillator source is used to clock the internal POR and
WDT counter chain. If the bit is a 1, the internal RC oscillator is bypassed, and the
POR and WDT clock source is driven from the external pin, XTAL1. The default
configuration of this bit is 0, which selects the RC oscillator.
5 Clock Filter
INTERNAL
Low Operating
Voltage Det.
OSC.
RC
P
M
U
X
*CLR2
CLK
R
CLK
E
POR
*CLR1
L
I
5 ms 10 ms 20 ms
WDT/POR Counter Chain
M
18 Clock RESET
I
Generator
WDT
V
CC
N
A
40/44/48-Pin Low-Voltage IR OTP
TAP SELECT
R
RESET
Y
80 ms
Z86D73
Internal
RESET
Active
High
66