HD64F2623FA20J Renesas Electronics America, HD64F2623FA20J Datasheet - Page 203

• Manufacturer Part Number: HD64F2623FA20J
• Description: IC H8S MCU FLASH 256K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of HD64F2623FA20J

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

7.7
The H8S/2626 Group and H8S/2623 Group have a write data buffer function in the external data
bus. Using the write data buffer function enables external writes 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 7.17 shows an example of the timing when the write data buffer function is used. When this
function is used, if an external write continues for 2 states or longer, and there is an internal access
next, only an external write 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
Internal address bus
Internal read signal
Figure 7.17 Example of Timing when Write Data Buffer Function is Used
Write Data Buffer Function
HWR, LWR
D15 to D0
A23 to A0
T
1
On-chip memory read Internal I/O register read
T
Internal memory
2
External write cycle
External address
Rev. 5.00 Jan 10, 2006 page 177 of 1042
T
W
Internal I/O register address
T
W
Section 7 Bus Controller
REJ09B0275-0500
T
3