Datasheet

Analog Integrated Circuit Device Data
Freescale Semiconductor 138
MC34708
Functional Block Description
TSEN 12 R/W DIGRESETB 0x0
Enable the Touch screen from low power mode.
TSSTART 13 R/W DIGRESETB 0x0
Request a start of the ADC Reading Sequencer for Touch
screen readings.
TSCONT 14 R/W DIGRESETB 0x0
Run ADC reads of Touch screen continuously when high or
one time when low.
TSHOLD 15 R/W DIGRESETB 0x0
Hold the ADC reading Sequencer while saved Touch screen
results are read from SPI
TSSTOP[2:0] 18-16 R/W DIGRESETB 0x0
Just like the ADSTOP above, but for the Touchscreen read
programming. This will allow independent code for ADC
Sequence readings and touchscreen ADC Sequence
readings.
Spare 19 R/W DIGRESETB 0x0
Not available
TSPENDETEN 20 R/W DIGRESETB 0x0
Enable the Touchscreen Pen Detection. Note that TSEN
must be off for Pen Detection.
Spare 23-21 R/W DIGRESETB 0x0
Not available
Table 148. Register 44, ADC 1
Name Bit # R/W Reset Default Description
ADDLY1[3:0] 3-0 R/W DIGRESETB 0x0
This will allow delay before the ADC readings.
ADDLY2[3:0] 7:4 R/W DIGRESETB 0x0
This will allow delay between each of ADC readings in a set.
ADDLY3[3:0] 11-8 R/W DIGRESETB 0x0
This will allow delay after the set of ADC readings. This delay
is only valid between subsequent wrap around reading
sequences with ADCONT
TSDLY1[3:0] 15-12 R/W DIGRESETB 0x0
This will allow delay before the ADC Touch screen readings.
This is like the ADDLY1, but allows independent
programming of touchscreen readings from general purpose
ADC readings to prevent code replacement in the system.
TSDLY2[3:0] 19-16 R/W DIGRESETB 0x0
This will allow delay between each of ADC Touch screen
readings in a set. This is like the ADDLY2, but allows
independent programming of touchscreen readings from
general purpose ADC readings to prevent code replacement
in the system.
TSDLY3[3:0] 23-20 R/W DIGRESETB 0x0
This will allow delay after the set of ADC Touch screen
readings. This delay is only valid between subsequent wrap
around reading sequences with TSCONT mode. This is like
the ADDLY3, but allows independent programming of
touchscreen readings from general purpose ADC readings
to prevent code replacement in the system.
Table 149. Register 45, ADC 2
Name Bit # R/W Reset Default Description
ADSEL0[3:0] 3-0 R/W DIGRESETB 0x0
Channel Selection to place in ADRESULT0
ADSEL1[3:0] 7-4 R/W DIGRESETB 0x0
Channel Selection to place in ADRESULT1
ADSEL2[3:0] 11-8 R/W DIGRESETB 0x0
Channel Selection to place in ADRESULT2
ADSEL3[3:0] 15-12 R/W DIGRESETB 0x0
Channel Selection to place in ADRESULT3
Table 147. Register 43, ADC 0
Name Bit # R/W Reset Default Description