EM78P451SWM datasheet(11/54 Pages) EMC

11 / 54 page

EM78P451S

8-Bit Microcontroller with OTP ROM

Product Specification (V1.0) 06.01.2004

• 7

(This specification is subject to change without further notice)

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".

(Port9)

IOC9

(I/O Port Control Register)

(SPI read buffer)

Reserve

(SPI write buffer)

(SPI status buffer)

(SPI control buffer)

IOCC

(Timer1 Control Register)

IOCD

(Pull_high Control Register)

(WDT Control Register)

(Timer1 register)

(Pulse width preset register)

Aaddress

R PAGE registers

IOC PAGE registers

(Indirect Addressing Register)

Reserve

(Time Clock Counter)

CONT (Control Register)

(Program Counter)

Reserve

(Status Register)

Reserve

(RAM Select Register)

Reserve

(Port5)

IOC5

(I/O Port Control Register)

(Port6)

IOC6

(I/O Port Control Register)

(Port7)

IOC7

(I/O Port Control Register)

IOCE

IOCF

(Interrupt Mask Register)

︰

General Registers

：

Bank0

Bank1

Bank2

Bank3

R3F

(Interrupt Status Register)

(Port8)

IOC8

(I/O Port Control Register)

Fig. 4 Data memory configuration

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