M30803FGFP#D5 Renesas Electronics America, M30803FGFP#D5 Datasheet - Page 198
M30803FGFP#D5
Manufacturer Part Number
M30803FGFP#D5
Description
MCU 3/5V 256K 100-QFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/80r
Datasheet
1.M30803FGGPU3.pdf
(360 pages)
Specifications of M30803FGFP#D5
Core Processor
M16C/80
Core Size
16-Bit
Speed
20MHz
Connectivity
SIO, UART/USART
Peripherals
DMA, PWM, WDT
Number Of I /o
85
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
20K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 10x10b, D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
100-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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Figure 25.3 DRAM refresh interval set register
1 .
0
C
• Refresh
9
0 .
8 /
B
The refresh method is CAS before RAS. The refresh interval is set by the DRAM refresh interval set
register (address 0041
refresh interval set register.
Use the following formula to determine the value to set in the refresh interval set register.
Refresh interval set register value (0 to 255) = refresh interval time / (BCLK frequency X 32) - 1
0
0
0
DRAM refresh interval set register
1
b7 b6 b5 b4 b3 b2 b1 b0
A
G
8
u
7
o r
. g
0 -
u
1
0
p
0
, 2
0
2
0
0
5
Page 185
Note: Refresh interval at 20 MHz operating (no division)
16
_______
). The refresh signal is not output in HOLD state. Figure 25.3 shows the DRAM
Bit symbol
Refresh interval = BCLK frequency X (refresh interval set bit + 1) X 32
f o
REFCNT0
REFCNT1
REFCNT2
REFCNT3
REFCNT4
REFCNT5
REFCNT6
REFCNT7
3
2
9
REFCNT
_______
Symbol
Refresh interval set bit
Bit name
Address
00041
16
Indeterminate
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0 0 0 : 1.6 µs
0 0 0 0 0 0 0 1 : 3.2 µs
0 0 0 0 0 0 1 0 : 4.8 µs
1 1 1 1 1 1 1 1 : 409.6 µs
When reset
•
•
•
Function
25. DRAM Controller
(Note)
R
W
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