MC68HC05BD3 Datasheet, PDF (96/112 Pages) Motorola, Inc – HCMOS microcontroller

12.5
M-Bus Timing
Table 12-3 M-Bus Interface Input Signal Timing
(V_DD=5.0Vdc ±10%, V_SS=0Vdc, temperature range=0 to 70°C)
PARAMETER
SYMBOL MINIMUM
START condition hold time
Clock low period
Clock high period
Data set-up time
Data hold time
START condition set-up time
(for repeated START condition only)
t_HD.STA
2
t_LOW
4.7
t_HIGH
4
t_SU.DAT
250
t_HD.DAT
0
t_SU.STA
2
STOP condition set-up time
t_SU.STO
2
MAXIMUM
–
–
–
–
–
–
–
UNIT
t_CYC
t_CYC
t_CYC
ns
t_CYC
t_CYC
t_CYC
Table 12-4 M-Bus Interface Output Signal Timing
(V_DD=5.0Vdc ±10%, V_SS=0Vdc, temperature range=0 to 70°C)
PARAMETER
SYMBOL MINIMUM
START condition hold time
Clock low period
Clock high period
SDA/SCL rise time (see note 1)
SDA/SCL fall time (see note 1)
Data set-up time
Data hold time
START condition set-up time
(for repeated START condition only)
t_HD.STA
t_LOW
t_HIGH
t_R
t_F
t_SU.DAT
t_HD.DAT
t_SU.STA
8
11
11
–
–
t_LOW – t_CYC
1
10
STOP condition set-up time
Note:
t_SU.STO
10
MAXIMUM
–
–
–
1
300
–
–
–
–
UNIT
t_CYC
t_CYC
t_CYC
µs
ns
ns
t_CYC
t_CYC
t_CYC
1. With 200pF loading on the SDA/SCL pins
12
SDA
t_F
t_R
SCL
t_HD.STA t_LOW
t_HIGH
t_SU.DAT t_HD.DAT
t_SU.STA
Figure 12-1 M-Bus Timing
MOTOROLA
12-4
ELECTRICAL SPECIFICATIONS
t_SU.STO
TPG
MC68HC05BD3