EM78451
8-Bit Microcontroller
PS1
0
0
1
1
PS0
0
1
0
1
Program memory page [Address]
Page 0 [000-3FF]
Page 1 [400-7FF]
Page 2 [800-BFF]
Page 3 [C00-FFF]
Bit 7 (GP)
General read/write bit.
4.1.5 R4 (RAM Select Register)
Bits 0~5
are used to select the registers (address: 00~3F) in the indirect addressing
mode.
Bits 6~7
determines which bank is activated among the 4 banks.
If indirect addressing is not used, the RSR is used as an 8-bit general-purpose
read/writer register.
See the configuration of the data memory in Fig. 4.
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)
General 6-bit I/O registers.
The values of the two most significant bits are read as "0".
6
•
Product Specification (V1.2) 05.27.2004
(This specification is subject to change without further notice)
EMC [ ELAN MICROELECTRONICS CORP ]
