Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 27

• Manufacturer Part Number: Z90251
• Description: eZVision 200 Television Controllers with OSD
• Manufacturer: ZILOG [Zilog, Inc.]

Table 6
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Stop flag
Stop Recovery level
Stop Delay
Stop Mode Recover
Source
External Clock Divide by 2
SCLK/TCLK Divide by 16
SCLK/TCLK Divide-by-16
Select (bit O)
Stop Mode Recovery (SMR) Register 0Bh: Bank F (SMR)
R
7
0
W
6
0
Bit
Position
4-2
7
6
5
1
0
W
5
1
This bit controls a divide-by-16 prescaler of
SCLK/TCLK. The purpose of this control is to
reduce device power consumption selectively
during normal processor execution (SCLK
control) and/or Halt Mode (where TCLK
sources counter/timers and interrupt logic).
R/W
W
W
W
W
W
R
32 KB Television Controller with OSD
W
4
0
Value Description
000
001
010
011
100
101
110
111
0
1
0
1
0
1
0
1
0
1
W
3
0
POR
Stop Recovery
Low POR
High
Off
On POR
POR and /or External Reset
P63
P62
Must NOT be used
Must NOT be used
P27
P2 NOR 0-3
P2 NOR 0-7
SCLK/TCLK = XTAL/2 POR
SCLK/TCLK = XTAL
Off POR
On
W
2
0
W
1
0
PS001301-0800
W
0
0
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