TMP91CW28 Datasheet, PDF (198/286 Pages) Toshiba Semiconductor – Original CMOS 16-Bit Microcontroller

TMP91CW28
3.11 Analog-to-Digital Converter (ADC)
The TMP91CW28 has a 8-channel, multiplexed-input, 10-bit successive-approximation
analog-to-digital converter (ADC).
Figure 3.11.1 shows a block diagram of the ADC. The eight analog input channels (AN0 to
AN7) can be used as general-purpose digital inputs (Port 5) if not needed as analog channels.
Note:
Ensure that the ADC has halted before executing the HALT instruction to place the
TMP91CW28 in IDLE2, IDLE1 or STOP mode to reduce power supply current. Otherwise,
the TMP91CW28 might go into a standby mode while the internal analog comparator is still
active.
Internal data bus
Internal data bus
Internal data bus
AN7 (P57)
AN6 (P56)
AN5 (P55)
AN4 (P54)
AN3/ ADTRG (P53)
AN2 (P52)
AN1 (P51)
AN0 (P50)
AD mode control register 1
(ADMOD1)
ADTRGE
ADCH[2:0] VREFON
Channel
selection control
circuit
AD mode control register 0 (ADMOD0)
EOCF ADBF ITM0 REPEAT SCAN ADS
Scan
Repeat
Interrupt
Busy
ADTRG
End
Start
AD converter
control circuit
Interrupt request
(INTAD)
Sample-
and-hold
+
−
Comparator
AD conversion
result registers
(ADREG04L to 37L)
(ADREG04H to 37H)
VREFH
VREFL
DA converter
Figure 3.11.1 ADC Block Diagram
91CW28-196
2006-03-24