EM78815
8-Bit Microcontroller
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
0
0
1
1
0
1
0
1
7.2.8 R4 RAM Select for Common Registers R20~R3F, UART
Control Register
7.2.8.1 Page 0
Bit 7
RBS1
R/W-0
Bit 6
RBS0
R/W-0
Bit 5
RSR5
R/W-X
Bit 4
RSR4
R/W-X
Bit 3
RSR3
R/W-X
Bit 2
RSR2
R/W-X
Bit 1
RSR1
R/W-X
Bit 0
RSR0
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
1 → Enable
0 → Disable
Bit 1 (TXE) : Enable UART transmission function & UART interrupt mask
1 → Enable
0 → Disable
Bit 2 (ERE) : Enable UART receiver error interrupt mask
Product Specification (V2.4) 08.01.2004
(This specification is subject to change without further notice)
15
ELAN [ ELAN MICROELECTRONICS CORP ]
