M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 440

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Fig. 20.4.7 Structure of A-D control register
7703 GROUP
20.4 Functional description
20–10
20.4.5 A-D converter
The M37703’s analog inputs are 4 channels: AN
(1) One-shot and Repeat modes
(2) Single sweep and Repeat sweep modes
b7
AN
of the port P7 direction register when using A-D converter.
them input mode.
AN
inputs AN
Set the analog input select bits (bits 2 to 0 at address 1E
Set the bits of the port P7 direction register which do not have pins corresponding to analog inputs
Figure 20.4.7 shows the structure of the A-D control register and Figure 20.4.8 shows the structure
Set the bits of the port P7 direction register corresponding to AN
Set the bits of the port P7 direction register which do not have pins corresponding to analog inputs
b6
3
3
b5
to AN
to AN
b4
b3
3
6
6
to AN
to “1” to make them output mode. The A-D register contents corresponding to analog
to “1” to make them output mode.
b2
b1
6
, which do not have their pins, become undefined.
b0
A-D control register (Address 1E
Notes 1: These bits are ignored in the single sweep and repeat sweep modes. (They may be
Bit
4
5
1
2
6
7
0
3
2: When selecting an external trigger, the AN
3: Writing to each bit except bit 6 of the A-D control register must be performed while the
A-D operation mode select bits
Trigger select bit
Analog input select bits
(Valid in one-shot and repeat
modes) (Note 1)
A-D conversion start bit
A-D conversion frequency
(
either “0” or “1.”)
pin.
A-D converter halts.
7702/7703 Group User’s Manual
AD
) select bit
Bit name
0
to AN
16
)
2
and AN
16
b2 b1 b0
0 0 0 : AN
0 0 1 : AN
0 1 0 : AN
0 1 1 : Not selected
1 0 0 : Not selected
1 0 1 : Not selected
1 1 0 : Not selected
1 1 1 : AN
b4 b3
0 0 : One-shot mode
0 1 : Repeat mode
1 0 : Single sweep mode
1 1 : Repeat sweep mode
0 : Internal trigger
1 : External trigger
0 : Stop A-D conversion
1 : Start A-D conversion
0 : f
1 : f
) to one of “000
2
2
7
.
divided by 4
divided by 2
0
0
1
2
7
7
to AN
selected
selected
selected (Note 2)
selected
pin cannot be used as an analog input
Functions
2
and AN
2
”, “001
7
2
”, “010
pins to “0” to make
Undefined
Undefined
Undefined
At reset
2
0
0
0
0
0
” and “111
RW
RW
RW
RW
RW
RW
RW
RW
RW
2
.”