SDA5523 Micronas Semiconductor, SDA5523 Datasheet - Page 65

• Manufacturer Part Number: SDA5523
• Description: SDA55xx TVText Pro
• Manufacturer: Micronas Semiconductor

DATA SHEET
2.11. Analog Digital Converter (CADC)
TVTpro includes a four channel 8-bit ADC for control
purposes. By means of these four input signals the
controller is able to supervise the status of up to four
analog signals and take actions if necessary.
This analog signals can be connected to the Port 2
inputs without any special configuration. If the port pins
of Port 2 are used as digital input, make sure that the
input high level never exceeds VDDA.
The input range of the ADC is fixed to the analog sup-
ply voltage range (2.5 V nominal).
The conversion is done continuously on all four chan-
nels
CADC0 … CADC3 and updated automatically every
46 µs. An interrupt can be used to inform the micro-
controller about new available results.
Table 2–40: Related registers
Micronas
Register Name
CADC0
CADC1
CADC2
CADC3
CADCCO
CISR0
bit addressable
CISR1
bit addressable
PSAVE
bit addressable
PCON
See Section 3. on page 110 for detailed register description.
the
results
7
L24
CC
SMOD
are
stored
6
ADC
ADW
PDS
in
the
5
WTmr
IDLS
Sept. 10, 2004; 6251-556-3DS
SFRs
4
ADWULE
AVS
CADC
SD
2.11.1. Power-down and Wake-up
During idle mode it is required to reduce the power
consumption dramatically. In order to do this for the
controller ADC a special wake-up unit has been
included.
During this mode only the signal on input channel 1 is
supervised. As soon as the input signal has fallen
below a predefined level an interrupt is triggered and
the system wakes up.T wo different levels are avail-
able. The first one corresponds to (fullscale-4 LSB) the
second one to (fullscale-16 LSB). The actual level can
be selected by a control bit (ADWULE).
Nevertheless it is possible to send even this wake-up
unit into power-down (for detailed description refer to
Section 2.3.20. on page 45).
2.11.2. Registers
CADCO[7:0]
CADC1[7:0]
CADC2[7:0]
CADC3[7:0]
Bit Name
3
AD[3:0]
DVS
WAKUP
GF1
2
PWtmr
SLI_ACQ
GF0
1
AHS
IEX1
DISP
PDE
SDA 55xx
0
DHS
IEX0
PERI
IDLE
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