uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
7.3 Registers Controlling 8-<strong>Bit</strong> Timer<br />
CHAPTER 7 8-BIT TIMER<br />
The following register is used to control the 8-bit timer.<br />
• 8-bit timer mode control registers 80 and 81 (TMC80 and TMC81)<br />
(1) 8-bit timer mode control register 80 (TMC80)<br />
This register enables/stops operation of 8-bit timer counter 80 (TM80) and sets the counter clock of 8-bit timer<br />
80.<br />
TMC80 is set with a 1-bit or 8-bit memory manipulation instruction.<br />
RESET input clears TMC80 to 00H.<br />
Figure 7-3. 8-<strong>Bit</strong> Timer Mode Control Register 80 Format<br />
Symbol 6 5 4 3 2 1 0 Address After reset R/W<br />
TMC80 TCE80 0 0 0 0 TCL801TCL800 0 FF53H 00H R/W<br />
TCE80<br />
0<br />
1<br />
TCL801 TCL800<br />
0<br />
0<br />
1<br />
1<br />
Operation stopped (TM80 cleared to 0)<br />
Operation enabled<br />
0<br />
1<br />
0<br />
1<br />
fX/2 2 (1.25 MHz)<br />
fX/2 4 (312.5 kHz)<br />
fX/2 6 (78.1 kHz)<br />
Setting prohibited<br />
8-bit timer counter 80 operation control<br />
8-bit timer 80 count clock selection<br />
Caution Be sure to set the count clock after the timer operation is stopped (TCE80 = 0).<br />
Refer to 7.4 8-<strong>Bit</strong> Timer Operation for details.<br />
Remarks 1. fX: Main system clock oscillation frequency<br />
2. The parenthesized values apply to operation at fX = 5.0 MHz.<br />
Preliminary User’s Manual U14938EJ1V0UM 83
Change language