EM78815 datasheet(21/82 Pages) EMC

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EM78815

8-Bit Microcontroller

Product Specification (V2.4) 08.01.2004

(This specification is subject to change without further notice)

Bit 5 (IOCS) : IOC register select bit. Change IOC5 ~ IOCE to another page

Bit 6~Bir 7 (RS0 ~ RS1) : R register select bits. Change R1, R2, R4 ~ RE to another

page.

RS1

RS0

R Page

Page 0

Page 1

Page 2

Page 3

7.2.8 R4 RAM Select for Common Registers R20~R3F, UART

Control Register

7.2.8.1 Page 0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RBS1

RBS0

RSR5

RSR4

RSR3

RSR2

RSR1

RSR0

R/W-0

R/W-X

Bit 0 ~ Bit 5 (RSR0 ~ RSR5) : Indirect addressing for common registers R20 ~ R3F

RSR bits are used to select up to 32 registers (R20 to R3F) in indirect addressing

mode.

Bit 6 ~ Bit 7 (RB0 ~ RB1) : Bank selection bits for common registers R20 ~ R3F

These selection bits are used to determine which bank is activated among the 4

banks of the 32 registers (R20 to R3F).

Refer to Fig. 4 Control Register Configuration for details.

7.2.8.2 Page 1 Undefined Register

This register is unimplemented, not for use.

7.2.9 Page 2 UART Control Register 1

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TRS2

TRS1

TRS0

URM1

URM0

ERE

TXE

RXE

Bit 0 (RXE) : Enable UART receiving function & UART interrupt mask

→ Enable

→ Disable

Bit 1 (TXE) : Enable UART transmission function & UART interrupt mask

→ Enable

→ Disable

Bit 2 (ERE) : Enable UART receiver error interrupt mask

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