71M6513 Maxim, 71M6513 Datasheet - Page 39

• Manufacturer Part Number: 71M6513
• Description: The 71M6513 and 71M6513H are highly integrated SoCs with an MPU core, RTC, flash, and LCD driver
• Manufacturer: Maxim

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.
DIO
Pin number
Pin type
Data Register bit
Direction Register
bit
Internal Resources
Configurable
DIO
Pin number
Pin type
Data Register bit
Direction Register
bit
Internal Resources
Configurable
A Maxim Integrated Products Brand
Table 51: Data Registers, Direction Registers and Internal Resources for DIO Pin Groups
18
16
34
--
Y
N
0
0
0
0
19
17
16
LCD_NUM
LCD_MODE
LCD_CLK
LCD_EN
DIO_EEX
PULSEV/W
DIO_IN
DIO_OUT
LCD_NUM
DIO_GP
--
Y
N
1
1
1
1
DIO
LCD DISPLAY
DIGITAL I/O
DIO_DIR0 (SFR 0xA2)
DIO_DIR2 (SFR 0xA1)
DIO2=P2 (SFR 0xA0)
DIO0=P0 (SFR 0x80)
DRIVER
20
18
17
N
2
2
--
Y
2
2
© 2005-2011 Teridian Semiconductor Corporation
Figure 8: DIO Ports Block Diagram
Multi-use
21
19
64
N
3
3
--
Y
3
3
On-Chip Resources
60
20
65
Y
N
4
4
4
4
4
Multi-use
61
21
66
Y
N
5
5
5
5
5
62
22
Y
--
--
--
--
6
6
6
3-Phase Energy Meter IC
COM0..3
SEG6/SRDY
SEG20..23
DIO_0..3
SEG0..2, SEG3/SCLK,
SEG4/SSDATA,
SEG5/SFR, SEG7..19
SEG24/DIO4 ..
SEG27/DIO7
SEG28/DIO8 ..
SEG31/DIO11
SEG32/DIO12 ..
SEG41/DIO21
63
23
Y
--
--
--
--
7
7
7
67
8
0
0
Y
71M6513/71M6513H
68
Y
9
1
1
DATA SHEET
DIO_DIR1 (SFR 0x91)
DIO1=P1 (SFR 0x90)
10
69
Y
2
2
Multi-use
11
70
Y
3
3
12
98
N
4
4
13
99
N
5
5
SEPTEMBER 2011
14
30
N
6
6
Page: 39 of 104
15
31
N
7
7