71M6513/71M6513H
A Maxim Integrated Products Brand
3 -Phase      Energy Meter IC
DATA SHEET
SEPTEMBER 2011
On-Chip Resources
DIO Ports
The 71M6513/6513H includes up to 22 pins of general purpose digital I/O. 18 of these pins are dual function and can
alternatively be used as LCD drivers. Figure 8 shows a block diagram of the DIO section.
On reset or power-up, all DIO pins are inputs until they are configured for the desired direction. The pins are configured and
controlled by the DIO and DIO_DIR registers (SFRs) and by the five bits of the I/O register LCD_NUM (0x2020[4:0]). See the
description for LCD_NUM in the I/O RAM Section for a table listing the available segment pins versus DIO pins, depending on
the selection for LCD_NUM . Generally, increasing the value for LCD_NUM will configure an increasing number of general
purpose pins to be LCD segment pins, starting at the higher pin numbers.
LCD DISPLAY
COM0..3
DRIVER
SEG6/SRDY
SEG0..2, SEG3/SCLK,
SEG4/SSDATA,
LCD_NUM
LCD_MODE
LCD_CLK
LCD_EN
DIGITAL I/O
DIO_EEX
PULSEV/W
DIO_IN
DIO_OUT
LCD_NUM
DIO_GP
SEG5/SFR, SEG7..19
SEG20..23
SEG24/DIO4 ..
SEG27/DIO7
SEG28/DIO8 ..
SEG31/DIO11
SEG32/DIO12 ..
SEG41/DIO21
DIO_0..3
Figure 8: DIO Ports Block Diagram
DIO
Pin number
0
18
1
19
2
20
3
21
4
60
5
61
6
62
7
63
8
67
9
68
10
69
11
70
12
98
13
99
14
30
15
31
Pin type
DIO
Multi-use
Multi-use
Data Register bit
0
1
2 3 4 5
DIO0=P0 (SFR 0x80)
6
7
0
1
2 3 4 5
DIO1=P1 (SFR 0 x90)
6
7
Direction Register
--
--
--
--
4
5
6
7
0
1
2
3
4
5
6
7
bit
DIO_DIR0 (SFR 0 xA2)
DIO_DIR1 (SFR 0x91)
Internal Resources
Configurable
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
DIO
Pin number
16
34
17
16
18
17
19
64
20
65
21
66
22
--
23
--
Pin type
Multi-use
Data Register bit
0
1
2 3 4 5
DIO2=P2 (SFR 0xA0)
--
--
Direction Register
0
1
2
3
4
5
--
--
bit
DIO_DIR2 (SFR 0 xA1)
Internal Resources
Configurable
N
N
N
N
N
N
--
--
Table 51: Data Registers, Direction Registers and Internal Resources for DIO Pin Groups
? 2005-2011 Teridian Semiconductor Corporation
Page: 39 of 104
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