h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 167

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

7.1.3
Table 7.1 summarizes the pins of the bus controller.
Table 7.1
7.1.4
Table 7.2 summarizes the registers of the bus controller.
Table 7.2
Notes: 1. Lower 16 bits of the address.
Name
Address strobe
Read
High write
Low write
Wait
Name
Bus width control register
Access state control register
Wait control register H
Wait control register L
Bus control register H
Bus control register L
Pin function control register
2. Determined by the MCU operating mode.
Pin Configuration
Register Configuration
Bus Controller Pins
Bus Controller Registers
Symbol
AS
RD
HWR
LWR
WAIT
I/O
Output
Output
Output
Output
Input
Abbreviation
ABWCR
ASTCR
WCRH
WCRL
BCRH
BCRL
PFCR
Function
Strobe signal indicating that address output on address
bus is enabled.
Strobe signal indicating that external space is being
read.
Strobe signal indicating that external space is to be
written, and upper half (D15 to D8) of data bus is
enabled.
Strobe signal indicating that external space is to be
written, and lower half (D7 to D0) of data bus is
enabled.
Wait request signal used when accessing external
3-state access space.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Rev. 5.00 Sep 22, 2005 page 141 of 1136
Initial Value
H'FF/H'00 *
H'FF
H'FF
H'FF
H'D0
H'08
H'0D/H'00
Section 7 Bus Controller
2
REJ09B0257-0500
Address *
H'FED0
H'FED1
H'FED2
H'FED3
H'FED4
H'FED5
H'FDEB
1