16-13
MSM66591/ML66592 User's Manual
Chapter 16 A/D Converter Functions
16
[4]
A/D Control Register 1H (ADCON1H)
The ADCON1H is a 7-bit register that primarily controls the select mode of the A/D
converter 1.
Figure 16-8 shows the configuration of ADCON1H.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), ADCON1H becomes 80H.
<Description of Each Bit>
• ADSTM10–ADSTM13 (bit 0–bit 3)
These 4 bits specify the A/D conversion channel in select mode.
Change the select channel after setting STS1 (bit 4) to "0". When STS1 is "1" (when
A/D conversion is running in select mode), changing the select channel is invalid.
• STS1 (bit 4)
This bit specifies RUN/STOP of A/D conversion in select mode.
If this bit is "1", A/D conversion of the channel specified by ADSTM10–ADSTM13 (bit
0–bit 3) starts. This bit becomes "0" when A/D conversion ends.
• ADTM10, ADTM11 (bit 5, bit 6)
These 2 bits specify the number of clocks required for A/D conversion per channel.
Basically, the more the number of clocks required for A/D conversion is increased
(i.e. the longer the time required for A/D conversion is made), the higher the accu-
racy will be.
Changing the number of clocks during A/D conversion is ignored.
Содержание MSM66591
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