z86l88 ZiLOG Semiconductor, z86l88 Datasheet - Page 74

• Manufacturer Part Number: z86l88
• Description: Low-voltage Ir Microcontroller
• Manufacturer: ZiLOG Semiconductor

PS024102-0804
Recovery Source
From Stop Mode
Select (SMR)
WDTMR During STOP (D3)
This bit determines whether or not the WDT is active during STOP Mode. Since
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. See Figure 51.
Figure 51. Resets and WDT
Stop Delay
Ck source
(WDTMR)
VBO/VLV
2V Ref.
Select
XTAL
WDT
V
DD
12 ns Glitch Filter
*CLR1 and CLR2 enable the WDT/POR and
18 Clock Reset timers upon a Low-to-High input translation.
+
–
5 Clock
RD OSC.
Filter
Internal
Low Operating
Voltage Det.
M
U
X
*CLR2
CLK
CLK
POR
*CLR1
WDT/POR Counter Chain
7.5 ms
18 Clock Reset
Generator
V
7.5 ms
CC
WDT
Low-Voltage IR Microcontroller
15 ms
TAP SELECT
Reset
60 ms
Z86L88
Internal
Reset
Active
High
67