HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 735

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

This LSI has an on-chip high-speed static RAM. The on-chip RAM is connected to the CPU,
direct memory access controller (DMAC), data transfer controller (DTC), and advanced user
debugger (AUD)* by a 32-bit data bus, enabling 8, 16, or 32-bit width access to data in the on-
chip RAM. Data in the on-chip RAM can always be accessed in one cycle, providing high-speed
access that makes this RAM ideal for use as a program area, stack area, or data area. The on-chip
RAM is allocated to address H'FFFFE000 to H'FFFFFFFF. The contents of the on-chip RAM are
retained in sleep mode and standby mode, and by a power-on reset and a manual reset.
The on-chip RAM can be enabled or disabled by means of the RAME bit in the system control
register (SYSCR). For details on the system control register (SYSCR), refer to section 24.2.2,
System Control Register (SYSCR).
Note: * Flash version only.
21.1
• Module Standby Mode Setting
RAM0200A_010020030800
RAM can be enabled/disabled by the module standby control register (MSTCR1). The initial
value enables RAM operation. RAM access is disabled by setting the module standby mode.
For details, see section 24, Power-Down Modes.
Usage Note
Section 21 RAM
Rev.4.00 Mar. 27, 2008 Page 691 of 882
REJ09B0108-0400
21. RAM