EM6821 datasheet(44/68 Pages) EMMICRO

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EM6821

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12. Strobe Output

The Strobe output is used to indicate either the EM6821 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 11.1.1. Strobe Output Selection

StrobeOutSel1

StrobeOutSel0

Strobe

Terminal

Output

System

Reset

System Reset

and

WritePB

Sleep

12.1 Strobe Register

Table 12.1.1 Register RegLCDCntl1

Bit

Name

power on

value

R/W

Description

StrobeOutSel1

R/W

Strobe output select

StrobeOutSel0

R/W

Strobe output select

CkTripSel1

R/W

LCD multiplier clock select

CkTripSel0

R/W

LCD multiplier clock select

The CKTripSel1, CKTripSel0 values are reset with every system reset.

Figure 33 . Strobe Output

Reset, WritePB

StrobeOutSel1

StrobeOutSel0

Sleep

WritePB

Reset

Terminal

Strobe

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