Datasheet

 2010 Microchip Technology Inc. Preliminary DS39974A-page 525
PIC18F47J13 FAMILY
TABLE 30-28: MSSPx I
2
C™ BUS DATA REQUIREMENTS
FIGURE 30-21: EUSARTx SYNCHRONOUS TRANSMISSION (MASTER/SLAVE) TIMING
Param.
No.
Symbol Characteristic Min Max Units Conditions
100 T
HIGH Clock High Time 100 kHz mode 2(TOSC)(BRG + 1) — s
400 kHz mode 2(TOSC)(BRG + 1) — s
101 T
LOW Clock Low Time 100 kHz mode 2(TOSC)(BRG + 1) — s
400 kHz mode 2(TOSC)(BRG + 1) — s
102 TR SDAx and SCLx
Rise Time
100 kHz mode — 1000 ns CB is specified to be
from 10 to 400 pF
400 kHz mode 20 + 0.1 C
B 300 ns
103 TF SDAx and SCLx
Fall Time
100 kHz mode — 300 ns CB is specified to be
from 10 to 400 pF
400 kHz mode 20 + 0.1 CB 300 ns
90 T
SU:STA Start Condition
Setup Time
100 kHz mode 2(TOSC)(BRG + 1) — s Only relevant for
Repeated Start condition
400 kHz mode 2(TOSC)(BRG + 1) — s
91 THD:STA Start Condition
Hold Time
100 kHz mode 2(TOSC)(BRG + 1) — s After this period, the first
clock pulse is generated
400 kHz mode 2(T
OSC)(BRG + 1) — s
106 T
HD:DAT Data Input
Hold Time
100 kHz mode 0 — ns
400 kHz mode 0 0.9 s
107 T
SU:DAT Data Input
Setup Time
100 kHz mode 250 — ns (Note 1)
400 kHz mode 100 — ns
92 TSU:STO Stop Condition
Setup Time
100 kHz mode 2(TOSC)(BRG + 1) — s
400 kHz mode 2(T
OSC)(BRG + 1) — s
109 TAA Output Valid
from Clock
100 kHz mode — 3450 ns
400 kHz mode — 900 ns
110 T
BUF Bus Free Time 100 kHz mode 4.7 — s Time the bus must be
free before a new
transmission can start
400 kHz mode 1.3 — s
D102 C
B Bus Capacitive Loading — 400 pF
Note 1: A Fast mode I
2
C bus device can be used in a Standard mode I
2
C bus system, but parameter
#107  250 ns must then be met. This will automatically be the case if the device does not stretch the LOW
period of the SCLx signal. If such a device does stretch the LOW period of the SCLx signal, it must output
the next data bit to the SDAx line, parameter #102 + parameter #107 = 1000 + 250 = 1250 ns (for 100 kHz
mode), before the SCLx line is released.
121
121
120
122
TXx/CKx
RXx/DTx
pin
pin
Note: Refer to Figure 30-4 for load conditions.