HD6413003RF Datasheet, PDF(155/715 Page) Renesas Technology Corp – Microcontroller (MCU)

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HD6413003RF Datasheet, PDF (155/715 Pages) Renesas Technology Corp – Microcontroller (MCU)

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7.1.3 Input/Output Pins

Table 7-1 summarizes the refresh controllerâs input/output pins.

Table 7-1 Refresh Controller Pins

Pin Name

RFSH Refresh

Signal

Abbr.

RFSH

I/O

Output

HWR

LWR

RD

CS3

Upper write/upper column UW/UCAS Output

address strobe

Lower write/lower column LW/LCAS Output

address strobe

Column address strobe/

write enable

CAS/WE

Output

Row address strobe

RAS

Output

Function

Goes low during refresh cycles; used

to refresh DRAM and PSRAM

Connects to the UW pin of 2WE

DRAM or UCAS pin of 2CAS DRAM

Connects to the LW pin of 2WE DRAM

or LCAS pin of 2CAS DRAM

Connects to the CAS pin of 2WE

DRAM or WE pin of 2CAS DRAM

Connects to the RAS pin of DRAM

7.1.4 Register Configuration

Table 7-2 summarizes the refresh controllerâs registers.

Table 7-2 Refresh Controller Registers

Address*

Name

H'FFAC

Refresh control register

H'FFAD

Refresh timer control/status register

H'FFAE

Refresh timer counter

H'FFAF

Refresh time constant register

Note: * Lower 16 bits of the address.

Abbreviation R/W

RFSHCR

R/W

RTMCSR

R/W

RTCNT

R/W

RTCOR

R/W

Initial Value

H'02

H'07

H'00

H'FF

137

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