MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
14-1
Chapter 14
Internal Static RAM (SRAM)
14.1
Introduction
The SRAM provides 80 KB of general-purpose system SRAM. The first 32-KB of SRAM is powered by
a separate power supply pin for standby operation.
shows the internal SRAM block diagram.
Figure 14-1. Internal SRAM Block Diagram
The SRAM controller has these features:
•
Read/write accesses can map to SRAM from any master
•
32 KB with a separate power source for standby operation
•
Byte, halfword, word, and doubleword addressable
•
Single-bit correction and double-bit error detection
14.2
SRAM Operating Modes
lists and describes the SRAM operating modes.
14.3
External Signal Description
The external signal for SRAM is the V
STBY
RAM power supply. If the standby feature of the SRAM is
not used, tie the V
STBY
pin to V
SS
.
Table 14-1. SRAM Operating Modes
Mode
Description
Normal (functional)
Allows reads and writes of SRAM.
Standby
Preserves the 32 KB of standby memory when the 1.5 V power drops below the level of V
STBY
.
Updates to standby SRAM are inhibited during system reset or during standby mode.
SRAM
V
STBY
32 KB
Standby SRAM
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