PD17202AGF-011_15 Datasheet, PDF (17/30 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC (FRONT PANEL CONTROLLER)

µPD17202AGF-011
5.2 Serial Data Output
Serial data is output in synchronization with the rising of the CLOCK pin (pin 27) in the output status (the output
status is established only when the key data output command is executed).
Serial data is output in the following procedure. Figure 5-3 shows the timing chart of serial data output.
<1> Input a key data output command.
<2> Input a pulse to the LOAD pin (pin 28) (the output status is established when this pin goes high).
<3> Input the clock (data is output in synchronization with the rising of the clock).
<4> Input a pulse to the LOAD pin (the input status is established when this pin goes high).
Figure 5-3. Timing Chart of Serial Data Output
CLOCK
LSB
MSB
DATA
b0 b1 b2 b3
LOAD
Input data
Input status
LSB
K0 K1
MSB
K28 K29
Output data
Output status
Input status
15