em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 35

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
6.1.21 Bank 1 R8 TC2CR (Timer 2 Control)
Bits 7 ~ 6 (RCM1 ~ RCM0): IRC mode selection bits. The Bank 1 R8<7,6> is
Example:
1
st
Writer Trim IRC
Writer Trim IRC
RCM1
Step When user selects the 4 MHz at the Writer, the initial values of Bank 1
Bit 7
16 MHz
455kHz
4 MHz
8 MHz
4 MHz
The initial values of Bank 1 R8<7,6> will be kept the same as Word 1<3,2>.
If the IRC frequency is changed from A-frequency to B-frequency, the MCU needs to
wait for some time for it to work. The waiting time corresponds to the B-frequency.
R8<7,6> would be “00”, the same as the value of Word 1<3,2>. If the MCU
is free-running, it will work at 4 MHz ± 2.5%. Refer to the table below.
RCM0
Bit 6
RCM1
RCM1
Bank 1 R8<7,6>
Bank 1 R8<7,6>
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
TC2ES
Bit 5
enabled when Word 1<12> COBS0 = ”1”.
RCM0
RCM0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
EM78F648/644/642/641/548/544/542/541N
TC2M
Bit 4
4 MHz ± 2.5%
16 MHz ± 10%
8 MHz ± 10%
455kHz ± 10%
4 MHz ± 10%
16 MHz ± 2.5%
8 MHz ± 10%
455kHz ± 10%
4 MHz ± 10%
16 MHz ± 10%
8 MHz ± 2.5%
455kHz ± 10%
4 MHz ± 10%
16 MHz ± 10%
8 MHz ± 10%
455kHz ± 2.5%
16 MHz ± 10%
455kHz ± 10%
4 MHz ± 2.5%
8 MHz ± 10%
Frequency
NOTE
Frequency
TC2S
Bit 3
TC2CK2
Operating Voltage
Operating Voltage
Bit 2
2.2V ~ 5.5V
4.5V ~ 5.5V
3.0V ~ 5.5V
2.2V ~ 5.5V
2.2V ~ 5.5V
4.5V ~ 5.5V
3.0V ~ 5.5V
2.2V ~ 5.5V
2.2V ~ 5.5V
4.5V ~ 5.5V
3.0V ~ 5.5V
2.2V ~ 5.5V
2.2V ~ 5.5V
4.5V ~ 5.5V
3.0V ~ 5.5V
2.2V ~ 5.5V
2.2V ~ 5.5V
4.5V ~ 5.5V
3.0V ~ 5.5V
2.2V ~ 5.5V
Range
Range
8-Bit Microcontroller
TC2CK1
Bit 1
< 5 µs
< 1.5 µs
< 3 µs
< 50 µs
< 6 µs
< 1.25 µs
< 3 µs
< 50 µs
< 6 µs
< 1.5 µs
< 2.5 µs
< 50 µs
< 6 µs
< 1.5 µs
< 3 µs
< 45 µs
TC2CK0
< 1.5 µs
Stable
< 50 µs
Stable
Time
< 5 µs
< 3 µs
Time
Bit 0
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