Epson LX-HOO Technical Manual page 127

REV.-B
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,
bytes of RAM, and a serial interface. A system can be constructed easily using this IC. The main features
of this IC 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
1 KS 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)
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.
microprocessor,
PA 1
5
PAS
6
7
9
10
12
13
14
15
17
20
21
22
25
Fig. A-1. pPD7810/7811 Pin Diagram
A-2
and Tables A-2 through A-5 describe
60
5 9
5 6 PO 1
5 5
54
53
50
49
48 PF 1
47
46 ALE
45
44
43
A V
C C
42
41
40 I
A N ]
AV
SS
256