Microchip Technology DM164134 数据表
© 2006 Microchip Technology Inc.
DS41159E-page 349
PIC18FXX8
FIGURE 27-13:
EXAMPLE SPI™ MASTER MODE TIMING (CKE = 0)
TABLE 27-13: EXAMPLE SPI™ MODE REQUIREMENTS (MASTER MODE, CKE = 0)
SS
SCK
(CKP = 0)
(CKP = 0)
SCK
(CKP = 1)
(CKP = 1)
SDO
SDI
70
71
72
73
74
75, 76
78
79
80
79
78
MSb
LSb
Bit 6 - - - - - -1
MSb In
LSb In
Bit 6 - - - -1
Note: Refer to Figure 27-5 for load conditions.
Param
No.
Symbol
Characteristic
Min
Max Units
Conditions
70
TssL2scH,
TssL2scL
TssL2scL
SS
↓ to SCK ↓ or SCK ↑ Input
T
CY
—
ns
71
TscH
SCK Input High Time
(Slave mode)
(Slave mode)
Continuous
1.25 T
CY
+ 30
—
ns
71A
Single Byte
40
—
ns
(Note 1)
72
TscL
SCK Input Low Time
(Slave mode)
(Slave mode)
Continuous
1.25 T
CY
+ 30
—
ns
72A
Single Byte
40
—
ns
(Note 1)
73
TdiV2scH,
TdiV2scL
TdiV2scL
Setup Time of SDI Data Input to SCK Edge
100
—
ns
73A
T
B
2
B
Last Clock Edge of Byte 1 to the 1st Clock Edge
of Byte 2
of Byte 2
1.5 T
CY
+ 40
—
ns
(Note 2)
74
TscH2diL,
TscL2diL
TscL2diL
Hold Time of SDI Data Input to SCK Edge
100
—
ns
75
TdoR
SDO Data Output Rise Time
PIC18FXX8
—
25
ns
PIC18LFXX8
—
45
ns
76
TdoF
SDO Data Output Fall Time
—
25
ns
78
TscR
SCK Output Rise Time
(Master mode)
(Master mode)
PIC18FXX8
—
25
ns
PIC18LFXX8
—
45
ns
79
TscF
SCK Output Fall Time (Master mode)
—
25
ns
80
TscH2doV,
TscL2doV
TscL2doV
SDO Data Output Valid after
SCK Edge
SCK Edge
PIC18FXX8
—
50
ns
PIC18LFXX8
—
100
ns
Note 1:
Requires the use of parameter #73A.
2:
Only if parameter #71A and #72A are used.