EM78860
8-BIT MICRO-CONTROLLER
R4 ( RAM Select Register )
• Bit 0 ~ 5 are used to select up to 64 register in the indirect addressing mode.
• Bit 6 ~ 7 determine which bank is actived among the 4 banks.
• See the configuration of the data memory in Fig.4.
R5 ( Program Page Select Register)
7
-
6
-
5
-
4
-
3
PS3
2
PS2
1
PS1
0
PS0
• Bit 0 (pS0) ~ 3 (PS3) Page selec bits.
Page select bits
PS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
PS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
PS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
PS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
program memory page (Address)
Page 0
Page 1
Page 2
Page 3
Page 4
page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
• User can use PAGE instruction to change page. To maintain program page by user. Otherwise, user can use
far jump (FJMP) or far call (FCALL) instructions to program user's code. And the program page is maintained
by EMC's complier. It will change user's program by inserting instruction within program.
• Bit4~7 : unused
R6 ~R9 ( Port 6 ~ Port 9)
• Five 8-bit I/O registers.
RA
7
6
5
4
3
0
2
0
1
0
0
0
IDLE
/358E
/LPD
/LOW-BAT
• Bit0 ~ Bit3 unused, please set to "0"
* This specification are subject to be changed without notice.
6
6.24.1998
ELAN [ ELAN MICROELECTRONICS CORP ]
