Epson LX-86TM Especificações descarregar pdf (Página 127)

REV.-B

A.1.l

PPD781OHG

(CPU)

The 7810 (78 11 ) HG has the following differences from the conventional G type.

(a) Driving oscillation frequency is guaranteed up to 15 MHz.

(b) Reference voltage

AVref (A/D converter reference voltage) is different.

For point (b), the multiplier for the

AVref terminal’s peripheral circuit is different. Therefore, a board

with the HG type can use only HG type replacement parts. (The G type cannot be substituted.)

The

PPD78

10/781 1 is an 8-bit CPU that includes two 8-bit timer counters, an 8-bit A/D converter, 256

bytes of RAM, and a serial interface. A system can be constructed easily using this

IC.

The main features

of this

are as:

●

256 bytes of built-in RAM (addresses FFOOH -

FFFFH)

4096 bytes of mask ROM (addresses O -

OFFFH)

for the 7811 CPU

Direct addressing of up to 64K bytes

8-bit A/D converter

158 instructions

instruction cycle

16-bit event counter

Two 8-bit timer counters

3 external and 8 internal interrupts; 6 priority levels and 6 interrupt addresses

General purpose serial interface (asynchronous, synchronous, and

1/0 modes)

1/0 line (78 1 1: 40-bit 1/0 port; 78 10: 24 bit edge detection, 4 inputs)

Zero cross detection

Standby function

Built-in clock pulse circuit

NMOS

Figures A-1 and A-2 illustrate the 78 10/781 1

its functions.

PAO

PA2

PA3

PA4

PAS

PA6

PA7

PBO

PB1

PB2

PB3

PB4

PB5

PB6

PB7

Pco

PC2

PC3

PC4

PC5

PC6

PC7

INT

microprocessor,

and Tables A-2 through A-5 describe

Vcc

VDIY

PD7

PD6

PD5

PD4

PD3

PD2

PO 1

PDO

PF7

PF6

PF5

PF4

PF3

PF2

PFO

ALE

AVCC

VAREF

AN7

AN6

AN5

AN4

AN3

AN2

AN]

ANO

AV SS

Fig. A-1. pPD7810/7811 Pin Diagram

A-2

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 141 142

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