r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 331

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

If an external bus release request and external access occur simultaneously, the order of priority is
as follows:
If a refresh request and external bus release request occur simultaneously, the order of priority is
as follows:
6.12.2
Table 6.14 shows pin states in the external bus released state.
Table 6.14 Pin States in Bus Released State
Pins
A23 to A0
D15 to D0
CSn (n = 7 to 0)
UCAS, LCAS
AS/AH
RD
OE
HWR, LWR
DACKn (n = 1, 0)
EDACKn (n = 3, 2)
(High) External bus release > External access by internal bus master (Low)
(High) Refresh > External bus release (Low)
Pin States in External Bus Released State
Pin State
High impedance
High impedance
High impedance
High impedance
High impedance
High impedance
High impedance
High impedance
High
High
Rev. 1.00 Sep. 19, 2008 Page 301 of 1342
Section 6 Bus Controller (BSC)
REJ09B0467-0100