em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 53

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

4.11 MOUSE APPLICATION MODE
This specification is subject to change without prior notice.
1. Overview & Features
X2(TCC2)
X1(TCC1)
Overview:
Features:
Fig.25 shows how EM78P257A/B communicates with PS/2 connector of PC.
• RC oscillation.
• Six photo-couples input.
Y1(TCC3)
Y2(TCC4)
MOUSEN
MOUSEN
MOUSEN
MOUSEN
4.5R
4.5R
R
R
4.5R
4.5R
R
R
VCC
VCC
VCC
VCC
15K
15K
15K
15K
+
+
-
-
C1
C2
+
+
-
-
C3
C4
53
TCCA(UP/DOWN Counter)
TCCB(UP/DOWN Counter)
MOUSEN
MOUSEN
send data to PC
After MCU process
send data to PC
After MCU process
EM78P257
07.27.2004 (V1.4)
OTP ROM