M30222 Datasheet, PDF (166/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

deUvnedloepr ^ment
Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
A-D Converter
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(6) Operation of Simultaneous Sample and Hold Mode (SSH)
AN1 is sampled exactly the same time as the sampling ofAN0. The actual conversion occurs when a conver-
sion of AN1 is specifically requested. The request can be implicit as a part of a sweep mode or can be explicit
by writing an appropriate value to ADCON0. The conversion of input 1 must be completed within 33µs after
AN0 conversion is started.
A-D Usage Precautions
(1) Write to each bit (except bit 6) of A-D control register 0, to each bit of A-D control register 1, and to
bit 0 and 7 of A-D control register 2 when A-D conversion is stopped before a trigger occurs.
In particular, when the Vref connection bit is changed from “0” to “1”, start A-D conversion after an elapse of 1
µs or longer.
(2) When changing A-D operation mode, select analog input pin again.
(3) Using one-shot mode or single sweep mode
Read the correspondence A-D register after confirming A-D conversion is finished. (It is known by A-D conver-
sion interrupt request bit.)
(4) Using repeat mode, repeat sweep mode 0 or repeat sweep mode 1
Use the undivided main clock as the internal CPU clock.
(5) Use SSH only in conjunction with SMP at 33µs.
1-167