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EM78P221/2N
8-Bit Microcontroller with OTP ROM
20 •
Product Specification (V1.0) 10.19.2007
(This specification is subject to change without further notice)
6.2.30 Bank 3-R6 (IRC Control)-only for ICE
Bit 7 6 5 4 3 2 1 0
EM78P221/2N ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’
ICE220N C3 C2 C1 C0 RCM1 RCM0 ‘0’ ‘0’
Bits 7 ~ 2:
[With Simulator (C3~C0, RCM1~RCM0)]: IRC calibration bits in IRC oscillator mode.
In IRC oscillator mode of ICE220N simulator, these are the
IRC mode selection bits and IRC calibration bits.
[With EM78P221/2N]: Unimplemented, read as ‘0’.
Bits 7 ~ 4 (C3 ~ C0): Calibrator of internal RC mode
C3 C2 C1 C0 Frequency (MHz)
0 0 0 0 (1-36%) × F
0 0 0 1 (1-31.5%) × F
0 0 1 0 (1-27%) × F
0 0 1 1 (1-22.5%) × F
0 1 0 0 (1-18%) × F
0 1 0 1 (1-13.5%) × F
0 1 1 0 (1-9%) × F
0 1 1 1 (1-4.5%) × F
1 1 1 1 F (default)
1 1 1 0 (1+4.5%) × F
1 1 0 1 (1+9%) × F
1 1 0 0 (1+135%) × F
1 0 1 1 (1+18%) × F
1 0 1 0 (1+22.5%) × F
1 0 0 1 (1+27%) × F
1 0 0 0 (1+31.5%) × 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.
Bits 3 ~ 2 (RCM1 ~ RCM0): IRC mode selection bits
RCM 1 RCM 0 Frequency (MHz)
1 1 4 (default)
1 0 16
0 1 1
0 0 455kHz
Bits 1 ~ 0: are not used, fixed to "0" all the time.