C541U Datasheet, PDF (49/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
AC Characteristics (cont’d)
External Clock Drive Characteristics
Parameter
Oscillator period
High time
Low time
Rise time
Fall time
Oscillator duty cycle
Clock cycle
Symbol CPU Clock = 12 MHz Variable CPU Clock Unit
Duty cycle 0.4 to 0.6 1/CLP = 2 to 12 MHz
min.
max.
min.
max.
CLP
83.3
83.3
83.3
500
ns
TCL_H
33
–
33
CLP-TCL_L ns
TCL_L
33
–
33
CLP-TCL_H ns
t_R
–
12
–
12
ns
t_F
–
12
–
12
ns
DC
0.4
0.6
33 / CLP
1 - 33 / CLP –
TCL
33
50
CLP * DC_min CLP * DC_max ns
SSC Interface Characteristics
Parameter
Symbol
min.
Clock Cycle Time : Master Mode
Slave Mode
t_SCLK
t_SCLK
Clock high time
t_SCH
Clock low time
t_SCL
Data output delay
t_D
Data output hold
t_HO
Data input setup
t_S
Data input hold
t_HI
TC bit set delay
t_DTC
SLS low to first SCLK clock edge t_SC
Last SCLK clock edge to SLS high t_CS
SLS low to STO active
t_TS
SLS high to STO tristate
t_ST
Data output delay (already defined) t_D
667
667
300
300
–
0
100
50
–
2 t_CLCL
t_CLCL
0
–
–
Limit Values
max.
–
–
–
–
100
–
–
–
8 CLP
–
–
100
100
100
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Semiconductor Group
47