UM10237_2 © NXP B.V. 2008. All rights reserved.
User manual Rev. 02 — 19 December 2008 551 o f 792
1. Basic configuration
The SD/MMC is configured using the following registers:
1. Power: In the PCONP register (Tab le 4– 63), set bit PC_MCI.
Remark: On reset, the SD/MMC is disabled (PCMCI = 0).
2. Clock: In PCLK_SEL1 select PCLK_MCI (see Table 4–57).
3. Pins: Select SD/MMC pins and their modes in PINSEL0 to PINSEL4 and PINMODE0
to PINMODE4 (see Section 9–5).
4. Interrupts: Interrupts are enabled in the VIC using the VICIntEnable register
(Table7–106).
2. Introduction
The Secure Digital and Multimedia Card Interface (MCI) is an interface between the
Advanced Peripheral Bus (APB) system bus and multimedia and/or secure digital memory
cards. It consists of two parts:
The MCI adapter block provides all functions specific to the Secure Digital/MultiMedia
memory card, such as the clock generation unit, power management control,
command and data transfer.
The APB interface accesses the MCI adapter registers, and generates interrupt and
DMA request signals.
3. Features of the MCI
The following features are provided by the MCI:
Conformance to Multimedia Card Specification v2.11.
Conformance to Secure Digital Memory Card Physical Layer Specification, v0.96.
Use as a multimedia card bus or a secure digital memory card bus host. It can be
connected to several multimedia cards, or a single secure digital memory card.
DMA supported through the General Purpose DMA Controller.
4. SD/MMC card interface pin description
UM10237

Chapter 21: LPC24XX SD/MMC card interface

Rev. 02 — 19 December 2008 User manual
Table 481. SD/MMC card interface pin desc ription
Pin Name Ty pe Description
MCICLK Output Clock output
MCICMD Input Command input/output.
MCIDAT[3:0] Output Data lines. Only MCIDAT[0] is used for Multimedia cards.
MCIPWR Output Power Supply Enable for external SD/MMC power supply.