Fujitsu F2MC-16LX MB90580 Series Hardware Manual page 243

[bit 12] PAUS (A/D conversion pause):
This bit is set when the A/D conversion is paused.
Only one register is available for storing the A/D conversion result. Therefore, unless the conversion
results are transferred by I2OS, the result data would be continuously updated and destroyed in contin-
uous conversion.
To prevent the above condition, the system is designed so that a data register value must be trans-
ferred by I2OS before the next conversion data is saved. A/D conversion pauses during that period.
A/D conversion is resumed at the end of transfer by I2OS.
This register is valid only when I2OS is used.
* For the conversion data protection function, see Section 2.7.4, "Operations."
Upon a reset, this bit is initialized to '0.'
[bits 11 and 10] STS1 and STS0 (Start source select):
Upon a reset, these bits are initialized to '00.'
These bits are used to select the A/D conversion activation factor.
STS1
0
0
1
1
In a mode allowing two or more activation factors, A/D conversion is activated by the factor that is input
first.
The activation factor changes as soon as it is updated. Thus, take care when updating it during A/D
conversion.
* The external pin trigger is detected by the falling edge. If this bit is updated to external trigger
activation while the external trigger input level is 'L,' A/D may be activated at once.
* When timer is selected, PPG1 output is selected.
[bit 9] STRT (Start):
A/D conversion is activated when '1' is written to this bit.
To reactivate A/D conversion, write '1' to this bit again.
In stop mode, restart is disabled due to the operation functions.
Upon a reset, this bit is initialized to '0.'
Note: Do not perform forced termination and activation by software simultaneously.
(BUSY=0, STRT=1)
[bit 8] DA
This is a test bit. Always write '0' to this bit.
MB90580 Series
STS0
0 Activation by software
1 Activation by external pin trigger and software
0 Activation by timer and software
1 Activation by external pin trigger, timer, and software
16.3 Registers and Register Details
Function
Chapter 16: A/D Converter 223