AN2692 Freescale Semiconductor / Motorola, AN2692 Datasheet - Page 6

• Manufacturer Part Number: AN2692
• Description: MC9S12NE64 Integrated Ethernet Controller
• Manufacturer: Freescale Semiconductor / Motorola

MC9S12NE64 Integrated Ethernet Controller
MC9S12NE64 System Overview
The MC9S12NE64 is a single-chip Ethernet solution. Having an on-chip CPU, FLASH, RAM, MAC, and
PHY reduces the cost of implementing an embedded device with Ethernet connectivity, because no active
external components are required. The components required to enable the MC9S12NE64 and its
Ethernet interface are:
Figure 5
MC9S12NE64 80-pin package.
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MC9S12NE64 MCU
25-MHz clock
3.3-V power supply
High-speed LAN magnetics isolation module (available in integrated RJ45 connectors)
RJ45 connector
Capacitors and resistors
Optional: PHY status LEDs (available in integrated RJ45 connectors)
Optional: BDM connector
provides an illustration of the MC9S12NE64 minimum system circuit implementation using the
For basic operation of the MC9S12NE64 Ethernet controller, a 25-MHz
input with a tolerance of 25 ppm clock is required. The 25-MHz clock is
required to provide the clock input to the integrated PHY for its basic
operation. In addition, to operate at 100 Mbps, the internal bus clock must
be configured to 25 MHz. For 10 Mbps, an internal bus clock setting of 2.5
MHz is required as a minimum.
TO 2.5 V CONVERTER
SPI
18 KEY WAKEUP
Figure 4. Block Diagram of the MC9S12NE64
MC9S12NE64 Integrated Ethernet Controller, Rev. 0.2
VREG 3.3 V
IRQ PORTS
2 X SCI
EMAC
EPHY
IIC
HCS12 CPU WITH DEBUG MODULE
NOTE
10-BIT, 8-CH
16-BIT, 4-CH
64K FLASH
8K RAM
TIMER
ATD
Freescale Semiconductor