EM78869 查看數據表（PDF） - ELAN Microelectronics
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EM78869 Datasheet PDF : 38 Pages
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EM78869
8-Bit RISC Type Microprocessor
f) Set P9SL = 0, P9SH = 0. Port 9 sent probe signal to Port 7 and read Port 7 to get the key.
Note that a probe signal instruction delay will occur before the next instruction is
performed.
g) Set P9SH = 1, P9SL =1. Port 9 is defined as LCD signal and enable LCD.
NOTE
This procedure is also applicable to Port 6 and Port 8.
P9.3
P9.2
P9.1
P9.0
Com2
Seg
P7.3
P7.2
P7.1
Fig. 7 Key Scans Circuit
P7.0
vdd
v1
v2
v3
vlcd
Gnd
vdd
v1
v2
v3
vlcd
Gnd
30us
Fig. 8 Key Scan Signal
Bit 1: Port 7 PULL HIGH register option. Use default value.
16 of 34 07.12.2004 (V1.0)
This specification is subject to change without further notice.
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