Datasheet

78K0/Kx2-L CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
R01UH0028EJ0400 Rev.4.00 254
Sep 27, 2010
Figure 6-9. Format of Prescaler Mode Register 00 (PRM00)
Address: FFBBH After reset: 00H R/W
Symbol 7 6 5 4 3 2 1 0
PRM00 ES110 ES100 ES010 ES000 0 0 PRM001 PRM000
ES110 ES100 TI010 pin valid edge selection
0 0 Falling edge
0 1 Rising edge
1 0 Setting prohibited
1 1 Both falling and rising edges
ES010 ES000 TI000 pin valid edge selection
0 0 Falling edge
0 1 Rising edge
1 0 Setting prohibited
1 1 Both falling and rising edges
Count clock selection
Note 1
PRM001 PRM000
f
PRS = 2 MHz fPRS = 5 MHz fPRS = 10 MHz
0 0 fPRS 2 MHz 5 MHz 10 MHz
0 1 fPRS/2
2
500 kHz 1.25 MHz 2.5 MHz
1 0 fPRS/2
8
7.81 kHz 19.53 kHz 39.06 kHz
1 1 TI000 valid edge
Notes 2, 3
Notes 1. If the peripheral hardware clock (f
PRS) operates on the high-speed system clock (fXH) (XSEL = 1), the fPRS
operating frequency varies depending on the supply voltage.
• V
DD = 2.7 to 5.5 V: fPRS ≤ 10 MHz
• VDD = 1.8 to 2.7 V: fPRS ≤ 5 MHz
2. The external clock from the TI000 pin requires a pulse longer than twice the cycle of the peripheral
hardware clock (f
PRS).
3. Do not start timer operation with the external clock from the TI000 pin when in the STOP mode.
Remark f
PRS: Peripheral hardware clock frequency