参数资料
型号: M30600E8-XXXGP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 135/139页
文件大小: 1782K
代理商: M30600E8-XXXGP
Mitsubishi microcomputers
M16C / 60 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
A-D Converter
95
(a) Sample and hold
Sample and hold is selected by setting bit 0 of the A-D control register 2 (address 03D416) to “1”.
When sample and hold is selected, the rate of conversion of each pin increases. As a result, a 28 f AD
cycle is achieved with 8-bit resolution and 33 f AD with 10-bit resolution. Sample and hold can be
selected in all modes. However, in all modes, be sure to specify before starting A-D conversion
whether sample and hold is to be used.
(b) Extended analog input pins
In one-shot mode and repeat mode, the input via the extended analog input pins, ANEX0 and ANEX1,
can also be converted from analog to digital.
When bit 6 of the A-D control register 1 (address 03D716) is “1” and bit 7 is “0”, input via ANEX0 is
converted from analog to digital. The result of conversion is stored in A-D register 0.
When bit 6 of the A-D control register 1 (address 03D716) is “0” and bit 7 is “1”, input via ANEX1 is
converted from analog to digital. The result of conversion is stored in A-D register 1.
(c) External operation amp connection mode
In this mode, multiple external analog inputs via the extended analog input pins, ANEX0 and ANEX1,
can be amplified together by just one operation amp and used as the input for A-D conversion.
When bit 6 of the A-D control register 1 (address 03D716) is “1” and bit 7 is “1”, input via AN0 to AN7 is
output from ANEX0. The input from ANEX1 is converted from analog to digital and the result stored in
the corresponding A-D register. The speed of A-D conversion depends on the response of the exter-
nal operation amp. Do not connect the ANEX0 and ANEX1 pins directly. Figure 1.79 is an example of
how to connect the pins in external operation amp mode.
Figure 1.79. Example of external op-amp connection mode
Analog
input
External op-amp
AN0
AN7
AN1
AN2
AN3
AN4
AN5
AN6
ANEX1
ANEX0
Resistor ladder
Successive conversion register
Comparator
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