TMP91xy40FG Toshiba, TMP91xy40FG Datasheet - Page 186

• Manufacturer Part Number: TMP91xy40FG
• Manufacturer: Toshiba

Specifications of TMP91xy40FG

• Package: LQFP100
• Rom Types(m=mask,p=otp, F=flash,e=eeprom): M/F
• Rom Combinations: 128
• Ram Combinations: 4
• Architecture: 16-bit CISC
• Usb/spi Channels: -
• Uart/sio Channels: 4
• I2c/sio Bus Channels: -
• (s)dram Controller: -
• Adc 10-bit Channel: 4
• Da Converter: -
• Timer 8-bit Channel: 4
• Timer 16-bit Channel: 3
• Pwm 8-bit Channels: -
• Pwm 16-bit Channels: -
• Cs/wait Controller: -
• Dual Clock: Y
• Number Of I/o Ports: 61
• Power Supply Voltage(v): 2.2 to 3.6

3.16.2
Operational Description
(1) Analog reference voltages
(2) Selecting an analog input channel(s)
These pins establish the full-scale range for the internal resistor string, which divides
the range into 1024 steps. The digital result of the conversion is derived by comparing
the sampled analog input voltage to the resistor string voltages.
and VREFL. Once <VREFON> is cleared, the internal reference voltage requires a
recovery time of 3 μs to stabilize after <VREFON> is set to 1. This recovery time is
independent of the system clock frequency. The <ADS> bit in the ADMOD0 must then
be set to initiate a conversion.
•
•
selecting the AN0 pin as the conversion channel in channel-fixed mode. The AN0 to
AN3 pins can be used as general-purpose input ports when not used as analog input
channels.
The VREFH and VREFL pins provide the reference voltages for the AD converter.
Clearing the <VREFON> bit in the ADMOD1 turns off the switch between VREFH
There are two basic conversion modes: Fixed-channel mode and channel scan mode.
The <SCAN> bit in the ADMOD0 affects the conversion channel(s) that will be
selected as follows:
Table 3.16.1 shows how analog input channels are selected in each conversion mode.
After a reset, ADMOD0<SCAN> is initialized to 0 and ADMOD1<ADCH2:0> to 000,
selected from AN0 to AN3 via the ADMOD1<ADCH2:0> bits.
from four patterns via the ADMOD1<ADCH2:0> bits.
Fixed-channel mode (ADMOD0<SCAN> = 0)
Channel scan mode (ADMOD0<SCAN> = 1)
In this mode, the AD converter runs conversions on a single analog input channel
In this mode, the AD converter runs conversions on sequential channels selected
<ADCH2:0>
000
001
010
011
100
101
110
111
Table 3.16.1 Analog Input Channel Selection
Must not be selected.
Fixed-Channel Mode
<SCAN> = 0
91CW40-184
AN0
AN1
AN2
AN3
AN0
AN0 → AN1
AN0 → AN1 → AN2
AN0 → AN1 → AN2 → AN3
Channel Scan Mode
<SCAN> = 1
TMP91CW40
2008-09-19