TMP91xy20AFG Toshiba, TMP91xy20AFG Datasheet - Page 211

• Manufacturer Part Number: TMP91xy20AFG
• Manufacturer: Toshiba

Specifications of TMP91xy20AFG

• Package: LQFP144
• Rom Types(m=mask,p=otp, F=flash,e=eeprom): M
• Rom Combinations: 8
• Ram Combinations: 8
• Architecture: 16-bit CISC
• Usb/spi Channels: -
• Uart/sio Channels: 1
• I2c/sio Bus Channels: 1
• (s)dram Controller: 1
• Adc 10-bit Channel: 8
• Da Converter: -
• Timer 8-bit Channel: 4
• Timer 16-bit Channel: 1
• Pwm 8-bit Channels: -
• Pwm 16-bit Channels: -
• Cs/wait Controller: 4
• Dual Clock: Y
• Number Of I/o Ports: 77
• Power Supply Voltage(v): 3.0 to 3.6

3.11.2
Description of Operation
(1) Analog reference voltage
(2) Analog input channel selection
reference voltage is applied to the VREFL pin. To perform AD conversion, the reference
voltage, the difference between VREFH and VREFL, is divided by 1024 using string
resistance. The result of the division is then compared with the analog input voltage.
ADMOD1<VREFON> in AD mode control register 1. To start AD conversion in the
OFF state, first write a 1 to ADMOD1<VREFON>, wait 3 µs until the internal
reference voltage stabilizes (This is not related to fc), then set ADMOD0<ADS> to 1.
converter.
•
•
000. Thus pin AN0 is selected as the fixed input channel. Pins not used as analog input
channels can be used as standard input port pins.
A high-level analog reference voltage is applied to the VREFH pin; a low-level analog
To turn
The analog input channel selection varies depends on the operation mode of the AD
Table 3.11.1 illustrates analog input channel selection in each operation mode.
On a reset, ADMOD0<SCAN> is set to 0 and ADMOD1<ADCH2:0> is initialized to
In analog input channel fixed mode (ADMOD0<SCAN> = 0)
Setting ADMOD1<ADCH2:0> selects one of the input pins AN0 to AN7 as the
input channel.
In analog input channel scan mode (ADMOD0<SCAN> = 1)
Setting ADMOD1<ADCH2:0> selects one of the eight scan modes.
<ADCH2:0>
000
001
010
011
100
101
110
111
Table 3.11.1 Analog Input Channel Selection
off
the switch
Channel Fixed
<SCAN> = 0
91C820A-209
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
between
AN0
AN0 → AN1
AN0 → AN1 → AN2
AN0 → AN1 → AN2 → AN3
AN4
AN4 → AN5
AN4 → AN5 → AN6
AN4 → AN5 → AN6 → AN7
VREFH
Channel Scan
<SCAN> = 1
and
VREFL, write
TMP91C820A
2008-02-20
a
0 to