DF3052BX25V Renesas Electronics America, DF3052BX25V Datasheet - Page 180

• Manufacturer Part Number: DF3052BX25V
• Description: MCU 5V 512K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3052BX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 7 Refresh Controller
Bit 7—Self-Refresh Mode (SRFMD): Specifies DRAM or pseudo-static RAM self-refresh
during software standby mode. When PSRAME = 1 and DRAME = 0, after the SRFMD bit is set
to 1, pseudo-static RAM can be self-refreshed when the H8/3052BF enters software standby
mode. When PSRAME = 0 and DRAME = 1, after the SRFMD bit is set to 1, DRAM can be self-
refreshed when the H8/3052BF enters software standby mode. In either case, the normal access
state resumes on exit from software standby mode.
Bit 6—PSRAM Enable (PSRAME) and Bit 5—DRAM Enable (DRAME): These bits enable
or disable connection of pseudo-static RAM and DRAM to area 3 of the external address space.
When DRAM or pseudo-static RAM is connected, the bus cycle and refresh cycle of area 3 consist
of three states, regardless of the setting in the access state control register (ASTCR). If AST3 = 0
in ASTCR, wait states cannot be inserted.
When the PSRAME or DRAME bit is set to 1, bits 0, 2, 3, and 4 in RFSHCR and registers
RTMCSR, RTCNT, and RTCOR are write-disabled, except that the CMF flag in RTMCSR can be
cleared by writing 0.
Bit 4—Strobe Mode Select (CAS/WE
valid when PSRAME = 0 and DRAME = 1. This bit is write-disabled when the PSRAME or
DRAME bit is set to 1.
Rev. 3.00 Mar 21, 2006 page 150 of 814
REJ09B0302-0300
Bit 7: SRFMD
0
1
Bit 6: PSRAME
0
1
Bit 4: CAS/WE
0
1
WE
WE
WE
Description
DRAM or PSRAM self-refresh is disabled in software standby mode
DRAM or PSRAM self-refresh is enabled in software standby mode
0
1
0
1
Description
2WE mode
2CAS mode
Bit 5: DRAME
WE
WE
WE): Selects 2CAS or 2WE mode. The setting of this bit is
Description
Can be used as an interval timer
(DRAM and PSRAM cannot be directly connected)
DRAM can be directly connected
PSRAM can be directly connected
Illegal setting
(Initial value)
(Initial value)
(Initial value)