Renesas PROM Programming Adapter PCA7408 Manuale Utente Pagina 49
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M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
Rev.1.00 Oct 01, 2002 page 49 of 110
REJ03B0134-0100Z
8.8 A-D COMPARATOR
A-D comparator consists of a 6-bit D-A converter and a comparator.
The A-D comparator block diagram is shown in Figure 8.8.1.
The reference voltage “Vref” for D-A conversion is set by bits 0 to 5 of
the A-D control register 2 (address 00EF16).
The comparison result of the analog input voltage and the reference
voltage “Vref” is stored in bit 4 of the A-D control register 1 (address
00EE16).
For A-D comparison, set “0” to corresponding bits of the direction
register to use ports as analog input pins. Write the data to select
analog input pins for bits 0 to 2 of the A-D control register 1 and write
the digital value corresponding to Vref to be compared to bits 0
to 5 of the A-D control register 2. The voltage comparison is started
by writing to the A-D control register 2, and it is completed after 16
machine cycles (NOP instruction ✕ 8).
Fig. 8.8.1 A-D Comparator Block Diagram
A
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D
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Bits 0 to 2
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Bit 4
Switch tree
A-D control
register 2
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3Bit 2Bit 1Bit 0
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6
- 1. DESCRIPTION 0
- 2. FEATURES 0
- 3. APPLICATION 0
- REJ03B0134-0100Z 1
- Address 00E016 2
- Addresses 00DE16 and 00DF16 2
- Addresses 00E116 and 00E216 3
- Address 00E416 3
- Addresses 00E616 to 00E916 4
- Address 00E516 4
- Address 00EA16 5
- Addresses 00EC16 5
- Address 00ED16 6
- Addresses 00EE16 6
- Address 00EF16 7
- Addresses 00F416 7
- Address 00F516 8
- Addresses 00F916 8
- Address 00FB16 9
- Addresses 00FC16 9
- Address 00FD16 10
- Addresses 00FE16 10
- Address 00FF16 11
- Addresses 021B16 11
- 42P2R-A/E 13
- REVISION HISTORY 14
- RENESAS SALES OFFICES 15
- 8. FUNCTION BLOCK DESCRIPTION 16
- 8.1.1 CPU Mode Register 16
- RCR1 RCR0 21
- TABLE OF CONTENTS 24
- (4) Serial I/O interrupt 25
- (5) f(XIN)/4096 interrupt 25
- (6) Multi-master I 25
- C-BUS interface interrupt 25
- (7) BRK instruction interrupt 25
- 8.4 TIMERS 29
- 8.4.1 Timer 1 29
- 8.4.2 Timer 2 29
- 8.4.3 Timer 3 29
- 8.4.4 Timer 4 29
- Timer 34 Mode Register 30
- 8.5 SERIAL I/O 32
- 16), and the transfer 33
- OUT pin. Transfer 33
- 4. PIN CONFIGURATION 35
- Outline 42P4B 35
- Outline 42P2R-A/E 35
- 8.6 MULTI-MASTER I 37
- C-BUS INTERFACE 37
- C Data Shift Register 38
- C Address Register 39
- 16) is used to set ACK 40
- C Control Register 42
- (1) 7-bit addressing format 47
- (2) 10-bit addressing format 47
- (5) Writing to I 50
- C status register 50
- 8.8 A-D COMPARATOR 56
- 5. FUNCTIONAL BLOCK DIAGRAM 57
- 8.9 D-A CONVERTER 59
- 8.10 ROM CORRECTION FUNCTION 61
- 8.11 OSD FUNCTIONS 62
- OSD Control Register 65
- 8.11.1 Display Position 66
- 6. PERFORMANCE OVERVIEW 68
- Vertical Position Register i 69
- Horizontal Position Register 70
- 8.11.2 Character Size 71
- 8.11.3 Clock for OSD 73
- 8.11.4 Memory for OSD 74
- Border Selection Register 80
- 8.11.7 Multiline Display 81
- 8.11.8 OSD Output Pin Control 82
- 8.13. RESET CIRCUIT 85
- 8.14 CLOCK GENERATING CIRCUIT 86
- 8.17 ADDRESSING MODE 87
- 8.18 MACHINE INSTRUCTIONS 87
- 9. TECHNICAL NOTES 87
- 8.16 AUTO-CLEAR CIRCUIT 87
- 10. ABSOLUTE MAXIMUM RATINGS 88
- 7. PIN DESCRIPTION 90
- + Power source voltage 91
- 15. MULTI-MASTER I 92
- 16. PROM PROGRAMMING METHOD 93
- M37221EASP 95
- M37221EAFP 95
- 19. APPENDIX 96
- Pin Configuration (TOP VIEW) 96
- Memory Map 98
- Register (SFR) 100
- Program Counter at Reset 104
- Structure of Register 105
- Address 00C716 106
- Address 00CB16 107
- Address 00CD16 107
- Address 00D516 108
- Address 00D616 108
- Address 00D816 109
- Address 00D716 109
- Address 00D916 110
- Address 00DA16 110
- Address 00DB16 111
- Address 00DC16 111
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