DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 683

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

This LSI has an on-chip high-speed static RAM. The on-chip RAM is connected to the CPU by a
32-bit data bus (L bus), enabling 8, 16, or 32-bit width access to data in the on-chip RAM.
The on-chip RAM is allocated to different addresses according to each product as shown in figure
18.1. The on-chip RAM can be accessed from the CPU (via the L bus). An access from the L bus
(CPU) is a 1-cycle access. In addition, the contents of the on-chip RAM are retained in sleep mode
or software standby mode, and at a power-on reset or manual reset.
The on-chip RAM can be enabled or disabled by means of the RAME bit in the RAM control
register (RAMCR). For details on the RAM control register (RAMCR), refer to section 19.3.7,
RAM Control Register (RAMCR).
RAM0200A_010020030800
H'FFFFBFFF
H'FFFFA000
Figure 18.1 On-chip RAM Addresses
SH71251A/SH71241A
SH71253/SH71243/
SH71252/SH71242/
Section 18 RAM
(8 kbytes)
8 kbytes
Page 1
H'FFFFAFFF
H'FFFFA000
SH71250A/SH71240A
Rev. 5.00 Mar. 06, 2009 Page 663 of 770
(4 kbytes)
4 kbytes
Page 1
REJ09B0243-0500