em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 36

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

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
26 •
2
3
4
Bit 5 (TC2ES TC2 signal edge
Bit 4 (TC2M): Timer/Counter 2 mode select
nd
rd
th
Writer Trim IRC
Writer Trim IRC
Writer Trim IRC
Step
Step
Step If it is desired to set Bank 1 R8<7,6> = “01” while the MCU is working at
4 MHz
4 MHz
4 MHz
4 MHz ± 2.5%, the MCU needs to hold for 1.5 µs, then it will continue to
work at 16 MHz ± 10%.
If it is desired to set Bank 1 R8<7,6> = “11” while the MCU is working at
16 MHz ± 10%, the MCU needs to hold for 50 µs, then it will continue to
work at 455kHz ± 10%.
If it is desired to set Bank 1 R8<7,6> = “00” while the MCU is working at
455kHz ± 10%, the MCU needs to hold for 5 µs, then it will continue to work
at 4 MHz ± 2.5%.
For F642/542N, Bit 5 ~ Bit 4 are unused. Set to “0” all the time.
0: Increment if a transition from low to high (rising edge) takes place
1: increment if a transition from high to low (falling edge) takes place
0: Timer/counter mode
1: Window mode
on the TC2 pin.
on the TC2 pin.
RCM1
RCM1
RCM1
Bank 1 R8<7,6>
Bank 1 R8<7,6>
Bank 1 R8<7,6>
0
0
1
1
0
0
1
1
0
0
1
1
RCM0
RCM0
RCM0
0
1
0
1
0
1
0
1
0
1
0
1
(This specification is subject to change without further notice)
16 MHz ± 10%
455kHz ± 10%
16 MHz ± 10%
455kHz ± 10%
16 MHz ± 10%
455kHz ± 10%
4 MHz ± 2.5%
4 MHz ± 2.5%
4 MHz ± 2.5%
8 MHz ± 10%
8 MHz ± 10%
8 MHz ± 10%
NOTE
Frequency
Frequency
Frequency
Product Specification (V1.0) 05.05.2010
Operating Voltage
Operating Voltage
Operating Voltage
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
Range
Stable Time
Stable Time
Stable Time
< 1.5 µs
< 1.5 µs
< 1.5 µs
< 50 µs
< 50 µs
< 50 µs
< 5 µs
< 3 µs
< 5 µs
< 3 µs
< 5 µs
< 3 µs