HD6417034 Datasheet, PDF (133/691 Pages) Renesas Technology Corp – SuperH RISC ENGINE SH7032 AND SH7034

7.2.2 External Clock Input
An external clock signal can be input at the EXTAL pin as shown in figure 7.4. The XTAL pin
should be left open. The frequency must be equal to the system clock (CK) frequency. The
specifications for the waveform of the external clock input are given below. Make the external
clock frequency the same as the system clock (CK).
Open
XTAL
External clock input
EXTAL
Figure 7.4 External Clock Input Method
t_cyc
t_EXH
t_EXL
1/2 V_cc
V_IH
V_IL
t_EXr
t_EXf
Figure 7.5 Input Clock Waveform
Table 7.3 Input Clock Specifications
5 V Specifications
(fmax = 20 MHz)*¹
t_EXr/f (V_IL–V_IH) Max = 5
t_EXH/L
Min = 10
Notes: *1 Except SH7034B
*2 SH7034B only
3.3 V Specifications 3.3 V Specifications
(fmax = 12.5 MHz) (fmax = 20 MHz)*² Unit
Max = 10
Max = 5
ns
Min = 20
Min = 15
ns
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