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13
SLAU595A–October 2014–Revised July 2015
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Copyright © 2014–2015, Texas Instruments Incorporated
MSP430FR4133 LaunchPad™ Development Kit (MSP
‑
EXP430FR4133)
The MSP430FR4133 device has flexible LCD pins allowing any pin to be a SEG or a COM. This simplifies
layout for the user. The LCD connections are typically a tradeoff between easy layout and optimal memory
settings for cleaner user software, among other considerations. The flexibility of the MSP430FR4133
allowed an optimal memory setting for easy software, along with a simple layout on the PCB (see
Table 4).
Each LCDMEM register is eight bits, controlling up to eight segments. The FH-1138P is a 4-mux LCD, so
four COM pins are needed from the MSP430FR4133. With four COM pins, each segment pin controls four
bits or segments. This means that each LCDMEM register controls two segment pins, as shown in
Table 4. Note that LCDMEM14 to LCDMEM17 and LCDMEM20 and higher are not used due to layout
considerations.
Each alphanumeric character A1 to A6 is controlled by two adjacent LCDMEM registers for efficiency and
ease of use in software. This allows for a single 16-bit memory access to control the whole character, as
opposed to split memory regions requiring separate memory accesses.
Table 4. LCD to MSP430 Connections
LCDMEM
Port Pin
FR4133 Pin
LCD Pin
COM3
COM2
COM1
COM0
Port Pin
FR4133 Pin
LCD Pin
COM3
COM2
COM1
COM0
LCDM19 P5.7 L39 38 A6H A6J A6K A6P P5.6 L38 37 A6Q TX A6N RX
LCDM18 P5.5 L37 36 A6A A6B A6C A6D P5.4 L36 35 A6E A6F A6G A6M
LCDM17 P5.3 L35 P5.2 L34
LCDM16 P5.1 L33 P5.0 L32
LCDM15 P2.7 L31 P2.6 L30
LCDM14 P2.5 L29 P2.4 L28
LCDM13 P2.3 L27 P2.2 L26 34 B5 B3 B1 []
LCDM12 P2.1 L25 33 B6 B4 B2 BATT P2.0 L24 32 TMR HRT REC !
LCDM11 P6.7 L23 16 A4H A4J A4K A4P P6.6 L22 15 A4Q A4COL A4N A4DP
LCDM10 P6.5 L21 14 A4A A4B A4C A4D P6.4 L20 13 A4R A4F A4G A4M
LCDM9 P6.3 L19 12 A3H A3J A3K A3P P6.2 L18 11 A3Q ANT A3N A3DP
LCDM8 P6.1 L17 10 A3A A3B A3C A3D P6.0 L16 9 A3R A3F A3G A3M
LCDM7 P3.7 L15 8 A2H A2J A2K A2P P3.6 L14 7 A2Q A2COL A2N A2DP
LCDM6 P3.5 L13 6 A2A A2B A2C A2D P3.4 L12 5 A2E A2F A2G A2M
LCDM5 P3.3 L11 4 A1H A1J A1K A1P P3.2 L10 3 A1Q NEG A1N A1DP
LCDM4 P3.1 L9 2 A1A A1B A1C A1D P3.0 L8 1 A1E A1F A1G A1M
LCDM3 P7.7 L7 20 A5H A5J A5K A5P P7.6 L6 19 A5Q DEG A5N A5DP
LCDM2 P7.5 L5 18 A5A A5B A5C A5D P7.4 L4 17 A5E A5F A5G A5M
LCDM1 P7.3 L3 21 COM3 - - - P7.2 L2 22 - COM2 - -
LCDM0 P7.1 L1 23 - - COM1 - P7.0 L0 24 - - - COM0