em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 89

• 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)
In Timer mode, counting up is performed using the internal clock (rising edge trigger).
When the contents of up-counter match the TCR3D, the interrupt is generated and
the counter is then cleared. Counting up resumes after the counter is cleared.
In Counter mode, counting up is performed using the external clock input pin (TC3
pin). When the contents of up-counter match the TCR3D, interrupt is generated and
the counter is then cleared. Counting up resumes after the counter is cleared.
In Programmable Divider Output (PDO) mode, counting up is performed using the
internal clock. The contents of TCR3D are compared with the contents of up-counter.
The F/F output is toggled and the counter is cleared each time a match is found. The
F/F output is inverted and output to /PDO pin. This mode can generate 50% duty
pulse output. The F/F can be initialized by program and it is initialized to “0”
during reset. A TC3 interrupt is generated each time the /PDO output is toggled.
Timer/Counter 3 Configuration
Figure 6-10a Timer/Counter3 Configuration Block Diagram
Figure 6-10b PDO Mode Timing Diagram
EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
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