EM78911 데이터 시트보기 (PDF) - ELAN Microelectronics
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EM78911 Datasheet PDF : 37 Pages
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EM78911
8-bit micro-controller
5. R4 (RAM Select Register)
* Bits 0 ~ 5 are used to select up to 64 registers in the indirect addressing mode.
* Bits 6 ~ 7 determine which bank is activated among the 4 banks.
* See the configuration of the data memory in Fig. 5.
6. R5 (Program Page Select Register)
7
6
5
43 2
R57 R56 R55 R54 PS3 PS2
* Bit 0 (PS0) ~ 3 (PS3) Page select bits
Page select bits
PS3 PS2 PS1 PS0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
10
PS1 PS0
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 instructions within program.
*Bit4~7 : PORT5 4-bit I/O register
6. R6 ~ R9 (Port 6 ~ Port 9)
* Four 8-bit I/O registers.
7. RA (FSK Status Register)(bit 0,1,2,4 read only)
7
6
5
4
3
2
1
0
IDLE /358E /LPD /LOW_BAT /FSKPWR DATA /CD /RD
* Bit0 (Read Only) (Ring detect signal) 0/1 : Ring Valid/Ring Invalid
* Bit1(Read Only)(Carrier detect signal) 0/1 : Carrier Valid/Carrier Invalid
* Bit2(Read Only)(FSK demodulator output signal)
Fsk data transmitted in a baud rate 1200 Hz.
* Bit3(read/write)(FSK block power up signal)
1/0 : FSK demodulator block power up/FSK demodulator power down
7
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