DF61657CN35FTV Renesas Electronics America, DF61657CN35FTV Datasheet - Page 252

• Manufacturer Part Number: DF61657CN35FTV
• Description: IC H8SX/1657 MCU FLASH 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of DF61657CN35FTV

• Core Processor: H8SX
• Core Size: 32-Bit
• Speed: 35MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 82
• Program Memory Size: 768KB (768K x 8)
• Program Memory Type: FLASH
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• For Use With: 3DK1657 - DEV EVAL KIT FOR H8SX/1657
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 6 Bus Controller (BSC)
6.13.2
This LSI has a write data buffer function for the peripheral module access. Using the write data
buffer function enables peripheral module writes and on-chip memory or external access to be
executed in parallel. The write data buffer function is made available by setting the PWDBE bit in
BCR2 to 1. For details on the on-chip peripheral module registers, see table 6.26 in section 6.12,
Internal Bus.
Figure 6.45 shows an example of the timing when the write data buffer function is used. When this
function is used, if an internal I/O register write continues for two cycles or longer and then there
is an on-chip RAM, an on-chip ROM, or an external access, internal I/O register write only is
performed in the first two cycles. However, from the next cycle onward an internal memory or an
external access and internal I/O register write are executed in parallel rather than waiting until it
ends.
Rev. 2.00 Jun. 28, 2007 Page 226 of 864
REJ09B0341-0200
Write Data Buffer Function for Peripheral Modules
Figure 6.45 Example of Timing when Peripheral Module
Iφ
Internal
address bus
Pφ
Internal I/O
address bus
Internal I/O
data bus
Write Data Buffer Function is Used
Peripheral module write
Peripheral module address
On-chip
memory
read