EM78P451S
8-Bit Microcontroller with OTP ROM
4.1.6 R5~R8 (Port 5 ~ Port8)
Four general 8 bits I/O registers
Both P74 and P76 read or write data from the DATA pin, while both P75 and P77
read or write data from the CLK pin.
4.1.7 R9 (Port9)
A general 6-bit I/O register. The values of the two most significant bits are read as
"0".
Aaddress
R PAGE registers
IOC PAGE registers
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
︰
1F
20
：
3E
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
RA
RB
RC
RD
RE
RF
(Indirect Addressing Register)
(Time Clock Counter)
(Program Counter)
(Status Register)
(RAM Select Register)
(Port5)
(Port6)
(Port7)
(Port8)
(Port9)
(SPI read buffer)
(SPI write buffer)
(SPI status buffer)
(SPI control buffer)
(Timer1 register)
(Pulse width preset register)
IOCC
IOC5
IOC6
IOC7
IOC8
IOC9
Reserve
CONT
(Control Register)
Reserve
Reserve
Reserve
(I/O Port Control Register)
(I/O Port Control Register)
(I/O Port Control Register)
(I/O Port Control Register)
(I/O Port Control Register)
Reserve
Reserve
(Timer1 Control Register)
IOCD
(Pull_high Control Register)
IOCE
IOCF
(WDT Control Register)
(Interrupt Mask Register)
General Registers
Bank0
Bank1
Bank2
Bank3
3F
R3F
(Interrupt Status Register)
Fig. 4 Data memory configuration
Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
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EMC [ ELAN MICROELECTRONICS CORP ]
