DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 206
DF3048BVX25V
Manufacturer Part Number
DF3048BVX25V
Description
MCU 3/5V 128K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Specifications of DF3048BVX25V
Core Processor
H8/300H
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
70
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 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
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF3048BVX25V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Section 7 Refresh Controller
Operation in Power-Down State
The refresh controller operates in sleep mode. It does not operate in hardware standby mode. In
software standby mode RTCNT is initialized, but RFSHCR, RTMCSR bits 5 to 3, and RTCOR
retain their settings prior to the transition to software standby mode.
Example 1: Connection to 2WE
Figure 7.7 shows typical interconnections to a 2WE 1-Mbit DRAM, and the corresponding
address map. Figure 7.8 shows a setup procedure to be followed by a program for this example.
After power-up the DRAM must be refreshed to initialize its internal state. Initialization takes a
certain length of time, which can be measured by using an interrupt from another timer module, or
by counting the number of times RTMCSR bit 7 (CMF) is set. Note that no refresh cycle is
executed for the first refresh request after exit from the reset state or standby mode (the first time
the CMF flag is set; see figure 7.3). When using this example, check the DRAM device
characteristics carefully and use a procedure that fits them.
Rev. 3.00 Sep 27, 2006 page 178 of 872
REJ09B0325-0300
Figure 7.7 Interconnections and Address Map for 2WE
H8/3048B Group
H'60000
H'7FFFF
D
15
HWR
to D
LWR
WE
WE
WE 1-Mbit DRAM (1-Mbyte Mode)
CS
RD
A
A
A
A
A
A
A
A
8
7
6
5
4
3
2
1
3
0
DRAM area
a. Interconnections (example)
b. Address map
Area 3 (1-Mbyte mode)
WE
WE 1-Mbit DRAM (Example)
WE
A
A
A
A
A
A
A
A
RAS
CAS
UW
LW
OE
I/O
7
6
5
4
3
2
1
0
15
2WE 1-Mbit DRAM with
to I/O
16-bit organization
0
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