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EM6617 Datasheet(PDF) 42 Page - EM Microelectronic - MARIN SA |
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EM6617 Datasheet(HTML) 42 Page - EM Microelectronic - MARIN SA |
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42 / 65 page 
EM6617 Copyright © 2005, EM Microelectronic-Marin SA 42 www.emmicroelectronic.com 15. Strobe Output The Strobe output is used to indicate either the EM6617 reset condition, a write operation on port B (WritePB) or the sleep mode. The selection is done in register RegLcdCntl1. Per default, the reset condition is output on the Strobe terminal. For a port B write operation the strobe signal goes high for half a system clock period. Data can be latched on the falling edge of the strobe signal. This function is used to indicate when data on port B output terminals is changing. The reset signal on the Strobe output is a copy of the internal CPU reset signal. The Strobe pin remains active high as long as the CPU gets the reset. Both the reset condition and the port B write operation can be output simultaneously on the Strobe pin. The strobe output select latches are reset by initial power on reset only. Table 13.1.1. Strobe Output Selection StrobeOutSel1 StrobeOutSel0 Strobe Terminal Output 0 0 System Reset 0 1 System Reset and WritePB 1 0 WritePB 1 1 Sleep 15.1 Strobe register Table 15.1.1 register OPTPCandStr Bit Name Power on value R/W Description 3 NoPdPC 0 R/W no pull-down on PortC 2 NchOpDPC 0 R/W N-Channel Open Drain on PortC 1 StrobeOutSel1 0 R/W Strobe output selection 0 StrobeOutSel0 0 R/W Strobe output selection Default : System reset on STROBE output Figure 31 . Strobe Output Reset, WritePB StrobeOutSel1 StrobeOutSel0 Sleep WritePB Reset 3 01 2 1 0 Terminal Strobe |
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