S124 Datasheet, PDF (66/98 Pages) Renesas Technology Corp – 32-bit ARM Cortex-M0+ microcontroller

S124
2.3.11
CLKOUT Timing
2. Electrical Characteristics
Table 2.37 CLKOUT timing
Item
Symbol Min
Max
Unit*¹ Test conditions
CLKOUT CLKOUT pin output cycle*¹
VCC = 2.7 V or above t_Ccyc
VCC = 1.8 V or above
62.5
-
125
-
ns
Figure 2.50
VCC = 1.6 V or above
250
-
CLKOUT pin high pulse width*² VCC = 2.7 V or above t_CH
15
-
ns
VCC = 1.8 V or above
30
-
VCC = 1.6 V or above
150
-
CLKOUT pin low pulse width*² VCC = 2.7 V or above t_CL
15
-
ns
VCC = 1.8 V or above
30
-
VCC = 1.6 V or above
150
-
CLKOUT pin output rise time
VCC = 2.7 V or above t_Cr
VCC = 1.8 V or above
-
12
ns
-
25
VCC = 1.6 V or above
-
50
CLKOUT pin output fall time
VCC = 2.7 V or above t_Cf
VCC = 1.8 V or above
-
12
ns
-
25
VCC = 1.6 V or above
-
50
Note 1.
Note 2.
When the EXTAL external clock input or an oscillator is used with division by 1 (the CKOCR.CKOSEL[2:0] bits are 011b and
the CKOCR.CKODIV[2:0] bits are 000b) to output from CLKOUT, the above should be satisfied with an input duty cycle of 45 to
55%.
When the MOCO is selected as the clock output source (the CKOCR.CKOSEL[2:0] bits are 001b), set the clock output division
ratio selection to be divided by 2 (the CKOCR.CKODIV[2:0] bits are 001b).
CLKOUT pin output
t_Ccyc
t_CH
t_Cf
t_CL
t_Cr
Test conditions: V_OH = VCC × 0.7, V_OL = VCC × 0.3, I_OH = -1.0 mA, I_OL = 1.0 mA, C = 30 pF
Figure 2.50 CLKOUT output timing
R01DS0264EU0100 Rev.1.00
Feb 23, 2016
Page 66 of 95