CHAPTER 9: SPECIFICATIONS OF LCD BOARD

9.2 Precautions on Using

Follow the precautions described below to ensure that the LCD board board is used properly. Note, however, that some functions described here may not be available with some models. For details, refer to the technical manual for each model.

9.2.1 Notes on operations

Always be sure to power off all connected equipment before connecting or disconnecting the cable.

9.2.2 Difference from an actual IC

It is necessary to well know following differences from an actual IC on functions and characteristics. Unless there are considered, successful operation on the S5U1C63000H2 with the LCD board may not be reproduced on the actual IC.

(1)Initialization

In the actual IC, contents of the segment memory are indefinite at system reset and the LCD drive waveform output is also indefinite in response to this. It means that the segment memory and the LCD drive waveform are coincident even though both are indefinite. However, in this board, the segment memory and the LCD drive waveform output are not coincident. Therefore, any initialization routine that surely clears (or sets) the segment memory after the system reset must be installed.

(2)LCD segment RAM (for models that have fixed assignment of LCD segments to memory bits)

In the actual IC, when reading a segment memory address that includes bits not assigned for LCD segment, the non-assigned bits are always read as 0. However, in this board, the non-assigned bits in the segment memory can be read and write as a memory. Therefore, when reading such address, the non-assigned bits in the word (4 bits) must be ignored.

(3)Power supply range in external LCD power mode

When the LCD power is supplied from an external source in the external LCD power mode, following voltage formula must be satisfied. These terminals are located in the connector of the peripheral circuit board.

•For models that use VSS as GND level

VSS < VC1 < VC2 < VC3 < VC4 < VC5 ≤ VDD (= +5 V)

•For models that use VDD as GND level

VSS < VL5 < VL4 < VL3 < VL2 < VL1 ≤ VDD (= +5 V)

(4)Drive capability of SEG and COM terminals

The output drive capability of the SEG and COM terminals in this board is higher than those of the actual IC. The S5U1C63000H2 can not be used for evaluation of the electrical characteristics. The system should be design in consideration of the electrical characteristics described on the technical manual of each model.

(5)LCD drive voltage

The LCD drive voltage in this board may differ from that of the actual IC.

S5U1C63000H2 MANUAL

EPSON

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(S1C63 FAMILY IN-CIRCUIT EMULATOR)