em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 90

• 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
80 •
In Pulse Width Modulation (PWM) Output mode, counting up is performed using
internal clock. The contents of TCR3 are compared with the contents of up-counter.
The F/F is toggled when match is found. While the counter continues counting, the
F/F is toggled again when counter overflow occurs, then counter is cleared. The F/F
output is inverted and output to /PWM pin. A TC3 interrupt is generated each time an
overflow occurs. TCR3 is configured as 2-stage shift register and, during output,
will not switch until one output cycle is completed even if TCR3 is overwritten.
Therefore, the output can be changed continuously. TRC3 is also shifted for the first
time by setting TC3S to “1” after data is loaded to TCR3.
6.3.55 Bank0 R4F: TCR3D (Timer 3 Duty Buffer Register)
Bits 7~0(TCR3DB7~TCR13DB0): 8-bit Timer/Counter 3 of duty data buffer
6.3.56 Bank1 R5: P5PHCR (Port 5 Pull High Control Register)
Bit 7 (/PH57): Control bit used to enable the pull high of P57 pin
Bit 6 (/PH56): Control bit used to enable the pull high of P56 pin
Bit 5 (/PH55): Control bit used to enable the pull high of P55 pin
Bit 4 (/PH54): Control bit used to enable the pull high of P54 pin
Bit 3 (/PH53): Control bit used to enable the pull high of P53 pin
Bit 2 (/PH52): Control bit used to enable the pull high of P52 pin
Bit 1 (/PH51): Control bit used to enable the pull high of P51 pin
Bit 0 (/PH50): Control bit used to enable the pull high of P50 pin
TCR3D7
/PH57
Bit 7
Bit 7
TCR3D6
/PH56
Bit 6
Bit 6
0: Enable internal pull-high
1: Disable internal pull-high
Figure 6-10c PWM Mode Timing Diagram
TCR3D5
/PH55
Bit 5
Bit 5
TCR3D4
/PH54
Bit 4
Bit 4
(This specification is subject to change without further notice)
TCR3D3
/PH53
Bit 3
Bit 3
Product Specification (V1.0) 05.05.2010
TCR3D2
/PH52
Bit 2
Bit 2
TCR3D1
/PH51
Bit 1
Bit 1
TCR3D0
/PH50
Bit 0
Bit 0