Z90251 Datasheet, PDF (29/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
21
Stop Mode Recovery Level
Select (bit 6)
A 1 in this bit position indicates that a High level
on any one of the recovery sources wakes the
microcontroller from Stop Mode. A 0 indicates
Low-level recovery. The default is 0 on POR.
Cold or Warm Start (bit 7)
This bit is set by the device when Stop Mode is
entered. A 0 in this bit (cold) indicates that the
device reset by POR/WDT Reset. A 1 in this bit
(warm) indicates that the device awakens by a
SMR source.
SMR D4 D3 D2
0 00
VDD
SMR D4 D3 D2
001
010
SMR D4 D3 D2
1 01
P20
P63
P62
P27
P23
SMR D4 D3 D2
110
P20
SMR D4 D3 D2
1 11
P27
Stop-Mode Recovery Edge
Select (SMR)
To POR
Reset
To IRQ1
Figure 7 Stop Mode Recovery Source/Level Select
Note: If P62 is used as an SMR source, the digital mode of operation
must be selected before entering Stop Mode.
PS001301-0800