HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 166

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 8 Bus State Controller (BSC)
High-level duties of 35% and 50% can be selected for the RD signal using the RD duty bit
(RDDTY) in BCR. When RDDTY is set to 1, the high-level duty is 35% of the T1 state, enabling
longer access times for external devices. Only set to 1 when the operating frequency is a minimum
of 10 MHz.
Rev. 7.00 Jan 31, 2006 page 140 of 658
REJ09B0272-0700
Read
Write
Figure 8.12 Basic Timing of External Memory Space Access (2-State Read Timing)
WRH, WRL
AD15–AD0
AD15–AD0
A21–A0
CSn
RD
CK
When
RDDTY = 1
T1
When
RDDTY = 0
T2