M30800SFP-BL#U5 Renesas Electronics America, M30800SFP-BL#U5 Datasheet - Page 199

• Manufacturer Part Number: M30800SFP-BL#U5
• Description: MCU 3/5V 0K,PB-FREE 100-QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/80r

Specifications of M30800SFP-BL#U5

• Core Processor: M16C/80
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 45
• Program Memory Type: ROMless
• Ram Size: 10K 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: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

M
R
R
e
E
1
v
J
6
1 .
0
C
9
0 .
8 /
B
The DRAM self-refresh operates in STOP mode, etc.
When shifting to self-refresh, select DRAM ignored by the DRAM space select bit. In the next instruction,
simultaneously set the DRAM space select bit and self-refresh ON by self-refresh mode bit. Also, insert
two NOPs after the instruction that sets the self-refresh mode bit to "1".
Do not access external memory while operating in self-refresh. (All external memory space access is
inhibited. )
When disabling self-refresh, simultaneously select DRAM ignored by the DRAM space select bit and self-
refresh OFF by self-refresh mode bit. In the next instruction, set the DRAM space select bit.
Do not access the DRAM space immediately after setting the DRAM space select bit.
Example) One wait is selected by the wait select bit and 4MB is selected by the DRAM space select bit
Figures 25.4 to 25.6 show the bus timing during DRAM access.
0
0
0
1
A
8
G
u
7
o r
. g
0 -
Shifting to self-refresh
Disable self-refresh
u
1
0
p
0
, 2
0
2
0
•••
mov.b
mov.b
nop
nop
•••
•••
mov.b
mov.b
nop
nop
•••
0
5
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#00000001b,DRAMCONT
#10001011b,DRAMCONT
#00000001b,DRAMCONT
#00001011b,DRAMCONT
f o
3
2
9
;DRAM ignored, one wait is selected
;Set self-refresh, select 4MB and one wait
;Two nops are needed
;
;Disable self-refresh, DRAM ignored, one wait is
;selected
;Select 4MB and one wait
;Inhibit instruction to access DRAM area
25. DRAM Controller