DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 93

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

3.2.2
SYSCR selects saturating calculation for the MAC instruction, and controls reset source monitor,
Ram address space, and on-chip flash memory control.
Bit
7
6 to 4
3
2
1
0
System Control Register (SYSCR)
Bit Name Initial Value
MACS
⎯
XRST
FLASHE
⎯
RAME
0
All 0
1
0
0
1
R/W
R/W
R/W
R
R/W
R/W
R/W
Descriptions
MAC Saturation
Selects either saturating or non-saturating calculation
for the MAC instruction.
0: Non-saturating calculation for MAC instruction
1: Saturating calculation for MAC instruction
Reserved
The initial value should not be changed.
External Reset
Indicates reset source. Reset occurs as external reset
input or watchdog timer overflow.
0: Generated by watchdog timer overflow
1: Generated by external reset
Flash Memory Control Register Enable
Controls CPU access to the flash memory control
registers (FCCS, FPCS, FECS, FKEY, FMATS, and
FTDAR).
0: Flash memory control registers are not selected
1: Flash memory control registers are selected
Reserved
The initial value should not be changed.
RAM Enable
Enables or disables the on-chip RAM. The RAME bit
is initialized when the reset status is released.
0: On-chip RAM is disabled
1: On-chip RAM is enabled
Rev.2.00 May. 28, 2009 Page 53 of 732
REJ09B0059-0200