MCP3909 Microchip Technology, MCP3909 Datasheet - Page 27

• Manufacturer Part Number: MCP3909
• Description: Energy Metering IC with SPI Interface and Active Power Pulse Output
• Manufacturer: Microchip Technology

5.7
With microcontroller SPI ports, it is required to send
groups of eight bits. It is also required that the micro-
controller SPI port be configured to clock out data on
the falling edge of clock and latch data in on the rising
edge, or vice versa depending on the mode.
TABLE 5-4:
© 2006 Microchip Technology Inc.
Standard SPI
Terminology
Mode
0,0
0,1
1,0
1,1
Using the MCP3909 with
Microcontroller (MCU) SPI Ports
SPI MODE COMPATIBILITY
PIC Control Bits
CKP
0
0
1
1
State
CKE
1
0
1
0
Compatibility
MCP3909
—
—
—
√
Idle state for clock is low level, transmit (from PIC)
occurs from active to idle clock state
Idle state for clock is low level, transmit (from PIC)
occurs from idle to active clock state
Idle state for clock is high level, transmit (from PIC)
occurs from active to idle clock state
Idle state for clock is high level, transmit (from PIC)
occurs from idle to active clock state
5.7.1
The following table represents the standard SPI mode
terminology, the respective PIC bit settings, and a
description of compatibility for the MCP3909 device.
The MCP3909 works in SPI mode 0,1 mode, that is the
data is clocked out of the part on the rising edge and
clocked in on the falling edge of SCK.
SPI MODE DEFINITIONS
Description
MCP3909
DS22025A-page 27