UPD78F9500MA-CAC-A Datasheet, PDF (167/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 9 A/D CONVERTER (μPD78F920x ONLY)
(4) 8-bit A/D conversion result register (ADCRH)
This register is an 8-bit register that stores the A/D conversion result. It stores the higher 8 bits of a 10-bit
resolution result.
ADCRH can be read by an 8-bit memory manipulation instruction.
Reset signal generation makes ADCRH undefined.
Figure 9-7. Format of 8-Bit A/D Conversion Result Register (ADCRH)
Address: FF1AH After reset: Undefined R
Symbol
7
6
5
4
3
2
1
0
ADCRH
(5) Port mode register 2 (PM2) and port mode control register 2 (PMC2)
When using the when the P20/ANI0/TI000/TOH1, P21/ANI1/TI010/TO00/INTP0, P22/ANI2, and P23/ANI3 pins
for analog input, set PM20 to PM23 and PMC20 to PMC23 to 1. At this time, the output latches of P20 to P23
may be 0 or 1.
PM2 and PMC2 are set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PM2 to 00H and clears PMC2 to FFH.
Figure 9-8. Format of Port Mode Register 2 (PM2)
Address: FF22H After reset: FFH R/W
Symbol
7
6
5
PM2
1
1
1
4
3
2
1
0
1
PM23
PM22
PM21
PM20
PM2n
0
1
Pmn pin I/O mode selection (n = 0 to 3)
Output mode (output buffer on)
Input mode (output buffer off)
Figure 9-9. Format of Port Mode Control Register 2 (PMC2)
Address: FF84H After reset: 00H R/W
Symbol
7
6
5
PMC2
0
0
0
4
3
2
1
0
PMC23
PMC22
PMC21
0
PMC20
PMC2n
Operation mode specification (n = 0 to 3)
0
Port/Alternate-function (except A/D converter) mode
1
A/D converter mode
Caution If PMC20 to PMC23 are set to 1, the P20/ANI0/TI000/TOH1, P21/ANI1/TIO10/TO00/INTP0,
P22/ANI2, and P23/ANI3 pins cannot be used for any purpose other than the A/D converter
function.
Be sure to set 0 to the Pull-up resistor option register of the pin set in A/D converter mode.
User’s Manual U18172EJ3V0UD
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