RX62N Datasheet, PDF (15/25 Pages) Renesas Technology Corp – 100 MHz 32-bit RX MCU with FPU, 165 DMIPS, up to 512-Kbyte Flash, Ethernet, USB 2.0

RX62N Group and RX621 Group
16-Bit SDRAM Connection and Access Examples
Port function register 6 (PF6BUS) Bits: 8, Address: 0008 C106h
Bit
Symbol Setting Name
Function
R/W
b4
MDSDE 1
SDRAM pin enable bit
See b6 (DQM1E bit)
R/W
b6
DQM1E 1
DQM1 output enable bit
MDSDE DQM1E
R/W
11: SDRAM enabled (all pins)
b7
SDCLKE 1
SDCLK output enable bit
1: SDCLK output enabled
R/W
Data register (P0DR) Bits: 8, Address: 0008 C020h
Bit
Symbol Setting Name
Function
R/W
b2
B2
0
P02 output data stored bit
0: Output data = 0
R/W
b3
B3
0
P03 output data stored bit
0: Output data = 0
R/W
Data direction register (P0DDR) Bits: 8, Address: 0008 C000h
Bit
Symbol Setting Name
Function
R/W
b2
B2
1
P02 I/O data specification bit 1: Output port
R/W
b3
B3
1
P03 I/O data specification bit 1: Output port
R/W
(4) External bus
Initialization sequence control register (SDICR) Bits: 8, Address: 0008 3C20h
Bit
Symbol Setting Name
Function
R/W
b0
INIRQ
1
Initialization sequence start 1: Initialization sequence start
R/W
bit
SDRAM initialization register (SDIR) Bits: 16, Address: 0008 3C24h
Bit
Symbol Setting Name
Function
R/W
b3-b0 ARFI[3:0] 0001 Initialization auto refresh
0001: 4 cycles
R/W
period bits
b7-b4 ARFC
0010 Initialization auto refresh
0010: 2 times
R/W
[3:0]
count bits
b10-b8 PRC[2:0] 000
Initialization precharge cycle 000: 3 cycles
R/W
count setting bits
SDC control register (SDCCR) Bits: 8, Address: 0008 3C00h
Bit
Symbol Setting Name
Function
R/W
b0
EXENB 1
Operation enable bit
1: Operation enable
R/W
b5-b4 BSIZE 00
SDRAM bus width selection 00: Specifies a 16-bit bus space
R/W
[1:0]
bits
SDRAM mode register (SDMOD) Bits: 16, Address: 0008 3C48h
Bit
Symbol Setting Name
b14-b0 MR[14:0] 0230h Mode register setting bits
Function
R/W
Executing a write: Issues a mode R/W
register set command
R01AN0585EJ0202 Rev.2.02
Feb 14, 2014
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