HD64F2338VFC25 Renesas Electronics America, HD64F2338VFC25 Datasheet - Page 225
![MCU 3V 256K 144-QFP](/photos/12/30/123043/df2633f25v_sml.jpg)
HD64F2338VFC25
Manufacturer Part Number
HD64F2338VFC25
Description
MCU 3V 256K 144-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2300r
Datasheet
1.DF2338VFC25V.pdf
(1246 pages)
Specifications of HD64F2338VFC25
Core Processor
H8S/2000
Core Size
16-Bit
Speed
25MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
106
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 12x10b; D/A 4x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
144-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD64F2338VFC25
Manufacturer:
Renesas Electronics America
Quantity:
10 000
- Current page: 225 of 1246
- Download datasheet (7Mb)
6.9
The chip has a write data buffer function for the external data bus. Using the write data buffer
function enables external writes and DMA single address mode transfers to be executed in parallel
with internal accesses. The write data buffer function is made available by setting the WDBE bit
in BCRL to 1.
Figure 6.36 shows an example of the timing when the write data buffer function is used. When this
function is used, if an external write or DMA single address mode transfer continues for two states
or longer, and there is an internal access next, an external write only is executed in the first state,
but from the next state onward an internal access (on-chip memory or internal I/O register
read/write) is executed in parallel with the external write rather than waiting until it ends.
External
space
write
Note: n = 0 to 7
Internal address bus
Internal read signal
Figure 6.36 Example of Timing when Write Data Buffer Function is Used
Write Data Buffer Function
A
CS
HWR, LWR
D
23
15
n
to A
to D
0
0
T
1
On-chip memory read
Internal memory
T
2
External write cycle
External address
Rev.4.00 Sep. 07, 2007 Page 193 of 1210
T
W
Internal I/O register
T
register read
W
Internal I/O
address
REJ09B0245-0400
T
3
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