EM78P259N/260N
8-Bit Microprocessor with OTP ROM
6.1.6 R5 ~ R6 (Port 5 ~ Port 6)
R5 & R6 are I/O registers
The upper 2 bits of R5 are fixed to “0” (if EM78P259N is selected).
Only the lower 6 bits of R5 are available (this applies to EM78P259N only as
EM78P260N can use all the bits)
6.1.7 R7 (Port 7)
Bit
7
6
5
4
3
2
1
0
EM78P259N/260N
ICE259N
‘0’
C3
‘0’
C2
‘0’
C1
‘0’
C0
‘0’
‘0’
‘0’
‘0’
I/O
I/O
RCM1 RCM0
NOTE
ꢀ
ꢀ
R7 is an I/O register
For EM78P259N/260N, only the lower 1 bit of R7 is available.
Bit 7 ~ Bit 2:
[With EM78P259N/260N]: Unimplemented, read as ‘0’.
[With Simulator (C3~C0, RCM1, & RCM0)]: are IRC calibration bits in IRC oscillator
mode. Under IRC oscillator mode of ICE259N simulator,
these are the IRC mode selection bits and IRC calibration bits.
Bit 7 ~ Bit 4 (C3 ~ C0): Calibrator of internal RC mode
C3
C2
C1
C0
Frequency (MHz)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
(1-36%) x F
(1-31.5%) x F
(1-27%) x F
(1-22.5%) x F
(1-18%) x F
(1-13.5%) x F
(1-9%) x F
(1-4.5%) x F
F (default)
(1+4.5%) x F
(1+9%) x F
(1+135%) x F
(1+18%) x F
(1+22.5%) x F
(1+27%) x F
(1+31.5%) x F
1. Frequency values shown are theoretical and taken at an instance of
a high frequency mode. Hence, frequency values are shown for
reference only. Definite values depend on the actual process.
2. Similar way of calculation is also applicable to low frequency mode.
10 •
Product Specification (V1.0) 06.16.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
