HD6413007F20 Renesas Electronics America, HD6413007F20 Datasheet - Page 190
HD6413007F20
Manufacturer Part Number
HD6413007F20
Description
IC H8 MCU ROMLESS 5V 100QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Datasheet
1.D13007F20V.pdf
(798 pages)
Specifications of HD6413007F20
Core Processor
H8/300H
Core Size
16-Bit
Speed
20MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
35
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
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6. Bus Controller
6.5.11
The H8/3006 and H8/3007 are provided with a CAS-before-RAS (CBR) function and self-refresh
function as DRAM refresh control functions.
CAS-Before-RAS (CBR) Refreshing: To select CBR refreshing, set the RCYCE bit to 1 in
DRCRB.
With CBR refreshing, RTCNT counts up using the input clock selected by bits CKS2 to CKS0 in
RTMCSR, and a refresh request is generated when the count matches the value set in RTCOR
(compare match). At the same time, RTCNT is reset and starts counting up again from H'00.
Refreshing is thus repeated at fixed intervals determined by RTCOR and bits CKS2 to CKS0. A
refresh cycle is executed after this refresh request has been accepted and the DRAM interface has
acquired the bus. Set a value in bits CKS2 to CKS0 in RTCOR that will meet the refresh interval
specification for the DRAM used. When RAS down mode is used, set the refresh interval so that
the maximum RAS pulse width specification is met.
RTCNT starts counting up when bits CKS2 to CKS0 are set. RTCNT and RTCOR settings should
therefore be completed before setting bits CKS2 to CKS0.
Also note that a repeat refresh request generated during a bus request, or a refresh request during
refresh cycle execution, will be ignored.
RTCNT operation is shown in figure 6.24, compare match timing in figure 6.25, and CBR refresh
timing in figures 6.26 and 6.27.
Rev.5.00 Sep. 12, 2007 Page 160 of 764
REJ09B0396-0500
Refresh request
RTCOR
H'00
Refresh Control
RTCNT
Figure 6.24 RTCNT Operation
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