EM78P468N_0712 Datasheet, PDF (15/82 Pages) ELAN Microelectronics Corp – 8-Bit Microcontroller

EM78P468N/L
8-Bit Microcontroller
6.1.5 R4/RSR (RAM Select Register)
(Address: 04h)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
RBS1
RBS0
RSR5
RSR4
RSR3
Bit 2
RSR2
Bit 1
RSR1
Bit 0
RSR0
Bits 7 ~ 6 (RBS1 ~ RBS0): determine which bank is activated among the four banks.
See the data memory configuration in Fig. 6-2. Use the BANK instruction (e.g.
BABK 1) to change banks.
Bits 5 ~ 0 (RSR5 ~ RSR0): used to select up to 64 registers (Address: 00~3F) in
indirect addressing mode. If no indirect addressing is used, the RSR can be used
as an 8-bit general purpose read/writer register.
6.1.6 R5/Port 5 (Port 5 I/O Data and Page of Register Select
(Address: 05h)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R57
R56
R55
R54
−
−
−
IOCPAGE
Bits 7~4: Four bits I/O registers of Port 5
User can use the IOC50 register to define each bit either as input or output.
Bits 3~1: Not used
Bit 0 (IOCPAGE): change IOC5 ~ IOCF to another page
IOCPAGE = “0” : Page 0 (select register of IOC 50 to IOC F0)
IOCPAGE = “1” : Page 1 (select register of IOC 61 to IOC E1)
6.1.7 R6/Port 6 (Port 6 I/O Data Register)
(Address: 06h)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R67
R66
R65
R64
R63
R62
R61
R60
Bits 7~0: 8-bit I/O registers of Port 6
User can use the IOC60 register to define each bit either as input or output.
6.1.8 R7/Port 7 (Port 7 I/O Data Register)
(Address: 07h)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R77
R76
R75
R74
R73
R72
R71
R70
Bits 7~0: 8-bit I/O registers of Port 7
User can use the IOC70 register to define each bit either as input or output.
Product Specification (V1.6) 12.31.2007
•9
(This specification is subject to change without further notice)