Z86D990 Datasheet, PDF (82/102 Pages) Zilog, Inc. – Low-Voltage Micro controllers with ADC

Z86D990/Z86D991 OTP and Z86L99X ROM
Low-Voltage Microcontrollers with ADC
75
In Demodulation Mode, the T8 and T16 counter/timers are used to capture and
demodulate complex waveforms. The settings for CTR1 in Demodulation Mode
are given in Table 38.
Table 38. CTR1 Register (in Demodulation Mode) (Group/Bank 0Dh, Register 1)
Bit
7
6
5
4
Bit/Field
Demod
Mode _Input Edge_Detect
R/W
R/W R/W R/W R/W
Reset
0
0
0
0
R = Read, W = Write, X = Indeterminate
Bit
Position
Bit/Field
R/W Value
7_______ Mode
R/W 1
0
_6______ Demodulator_ R/W 1
Input
0
__54____ Edge_Detect
R/W 11
10
01
00
____32__ Glitch_Filter
R/W 11
10
01
00
______1_ Rising_Edge
R
1
R
0
W
1
W
0
_______0 Falling_Edge R
1
R
0
W
1
W
0
3
2
Glitch_Filter
R/W R/W
0
0
1
Rising
Edge
R/W
0
0
Falling
Edge
R/W
0
Description
Demodulation
Transmit
P20 as Demodulator Input
P51 as Demodulator Input
Reserved
Both Edges
Rising Edge
Falling Edge
16 SCLK Cycles
8 SCLK Cycles
4 SCLK Cycles
No Filter
Rising Edge Detected
No Rising Edge
Reset Flag to 0
No Effect
Falling Edge Detected
No Falling Edge
Reset Flag to 0
No Effect
PS003807-1002
PRELIMINARY