em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 15

• Manufacturer Part Number: em78p809n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
TC4CK2 TC4CK1 TC4CK0
TC4FF1
Bit 7
Bit 7
P97
PORT9 − Port 9 I/O Data Register ( Address: 09h )
TC4CR — Timer/Counter 4 Control Register ( Address: 0Bh )
Bit 7 ~ Bit 6 ( TC4FF1 ~ TC4FF0 ) : Timer/Counter4 flip-flop control.
Bit 7 ~ Bit 0 ( P97 ~ P90 ) : 8-bit Port 97 ~ Port 90 I/O data register
0
0
0
0
1
1
1
1
Bit 5 ( TC4S ) : Timer/Counter 4 start control.
Bit 4 ~ Bit 2 ( TC4CK2 ~ TC4CK 0 ) : Timer/Counter 4 Clock Source Select
Bit 1 ~ Bit 0 ( TC4M1 ~ TC4M0 ) : Timer/Counter 4 Operating Mode Select
TC4M1
0
0
1
1
TC4FF1
TC4S = “0” : Stop and clear counter
TC4S = “1” : Start
User can use IOC9 register to define each bit whether input or output.
TC4FF0
Bit 6
0
0
1
1
Bit 6
P96
0
0
1
1
0
0
1
1
TC4S
0
1
0
1
0
1
0
1
Bit 5
Bit 5
P95
TC4M0
0
1
0
1
External clock (TC4 pin)
TC4CK2
( Normal, Idle )
Bit 4
Bit 4
Clock Source
P94
Fc/2^11
Fc/2^7
Fc/2^5
Fc/2^3
Fc/2^2
Fc/2^1
TC4FF0
Fc
0
1
0
1
TC4CK1
Bit 3
Bit 3
P93
Pulse Width Modulation output
Programmable Divider output
TC4CK0
Operating Mode
( Fosc=8M )
Bit 2
Resolution
Timer/Counter
Bit 2
P92
Reserved
250uS
500nS
250nS
125nS
16uS
4uS
1uS
--
8-Bit Microcontroller
Operating Mode
TC4M1
Reserved
Bit 1
Bit 1
P91
Toggle
Clear
Set
EM78P809N
( Fosc=8M )
Max. Time
127.5uS
63.8uS
31.9uS
255uS
64mS
4mS
1mS
TC4M0
--
Bit 0
Bit 0
P90
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