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