Microchip Technology MCP3421DM-WS Ficha De Dados
© 2009 Microchip Technology Inc.
DS39632E-page 395
PIC18F2455/2550/4455/4550
FIGURE 28-13:
EXAMPLE SPI SLAVE MODE TIMING (CKE = 0)
TABLE 28-17: EXAMPLE SPI MODE REQUIREMENTS (SLAVE MODE TIMING, CKE = 0)
Param
No.
Symbol
Characteristic
Min
Max Units Conditions
70
TssL2scH,
TssL2scL
TssL2scL
SS
↓ to SCK ↓ or SCK ↑ Input
3 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
20
—
ns
73A
Tb2b
Last Clock Edge of Byte 1 to the First Clock Edge of Byte 2 1.5 T
CY
+ 40
—
ns
(Note 2)
74
TscH2diL,
TscL2diL
TscL2diL
Hold Time of SDI Data Input to SCK Edge
35
—
ns
75
TdoR
SDO Data Output Rise Time
PIC18FXXXX
—
25
ns
PIC18LFXXXX
—
45
ns
V
DD
= 2.0V
76
TdoF
SDO Data Output Fall Time
—
25
ns
77
TssH2doZ SS
↑ to SDO Output High-Impedance
10
50
ns
78
TscR
SCK Output Rise Time (Master mode) PIC18FXXXX
—
25
ns
PIC18LFXXXX
—
45
ns
V
DD
= 2.0V
79
TscF
SCK Output Fall Time (Master mode)
—
25
ns
80
TscH2doV,
TscL2doV
TscL2doV
SDO Data Output Valid after SCK Edge PIC18FXXXX
—
50
ns
PIC18LFXXXX
—
100
ns
V
DD
= 2.0V
83
TscH2ssH,
TscL2ssH
TscL2ssH
SS
↑ after SCK edge
1.5 T
CY
+ 40
—
ns
Note 1: Requires the use of Parameter 73A.
2: Only if Parameter 71A and 72A are used.
SS
SCK
(CKP = 0)
SCK
(CKP = 1)
SDO
SDI
70
71
72
73
74
75, 76
77
78
79
80
79
78
SDI
MSb
LSb
bit 6 - - - - - -1
MSb In
bit 6 - - - -1
LSb In
83
Note:
Refer to Figure 28-4 for load conditions.