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Update for 03-11-21 17:15

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Tyler Perkins 2021-11-03 17:15:01 -04:00
parent 7178088572
commit 39a231a24d
1 changed files with 16 additions and 2 deletions
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@ -42,7 +42,6 @@ Pins are controller by the atmega's ports. Each port has different port
registers. Each bit of the 8 bit register controls a single pin. Port D registers. Each bit of the 8 bit register controls a single pin. Port D
controls pins 0 through 7, C controls the analog pins, and B controls 8 through controls pins 0 through 7, C controls the analog pins, and B controls 8 through
13 13
* PortC * PortC
- Port C data regiser - Port C data regiser
- 0x28 - 0x28
@ -135,7 +134,7 @@ controlling Timer/Counter 1, along with Timer Counter 1 Control Register B
compare output mode for channel A and B respectivly. These are controlled with compare output mode for channel A and B respectivly. These are controlled with
2 bit combinations as shown below. 2 bit combinations as shown below.
NOTE These settings only apply to normal mode NOTE These settings only apply to normal mode, and are on TTCR1A
| Bits | Description | | Bits | Description |
---------------------- ----------------------
@ -191,6 +190,8 @@ set when The input capture set by WGM to be used as the TOP value. Bits 2-0 are
set when TCNT1 matches the value in OCR1B, OCR1A, when when TCNT1 overflows, set when TCNT1 matches the value in OCR1B, OCR1A, when when TCNT1 overflows,
respectivly. respectivly.
==== Prescaler ====
To make the clock useful, the following will be an example of how to use Timer To make the clock useful, the following will be an example of how to use Timer
1 to delay a certain amount of time. You will need the following information 1 to delay a certain amount of time. You will need the following information
@ -203,3 +204,16 @@ the desired freqency. Be sure that the value is smaller than the max timer
value. If it is to large, choose a larger prescaler. Then place this in the value. If it is to large, choose a larger prescaler. Then place this in the
OCR** Register and enable the desired interrupt. OCR** Register and enable the desired interrupt.
To assist in finding the correct value, below are the values of the clock speed
(16Mhz) over the prescalers.
NOTE to help with calculations, 0xFFFF is 65536 and 0xFF is 256
| prescaler | value |
---------------------
| 8 | 2000000 |
| 64 | 250000 |
| 256 | 62500 |
| 1024 | 15625 |