HD64F2638F20J Datasheet, PDF (201/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 7 Bus Controller
7.1.3 Pin Configuration
Table 7-1 summarizes the pins of the bus controller.
Table 7-1 Bus Controller Pins
Name
Address strobe
Read
High write
Low write
Symbol
AS
RD
HWR
LWR
I/O
Output
Output
Output
Output
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.
7.1.4 Register Configuration
Table 7-2 summarizes the registers of the bus controller.
Table 7-2 Bus Controller Registers
Name
Abbreviation R/W
Bus width control register
ABWCR
R/W
Access state control register ASTCR
R/W
Wait control register H
WCRH
R/W
Wait control register L
WCRL
R/W
Bus control register H
BCRH
R/W
Bus control register L
BCRL
R/W
Pin function control register
PFCR
R/W
Notes: 1. Lower 16 bits of the address.
2. Determined by the MCU operating mode.
Initial Value
H'FF/H'00^*2
H'FF
H'FF
H'FF
H'D0
H'08
H'0D/H'00
Address^*1
H'FED0
H'FED1
H'FED2
H'FED3
H'FED4
H'FED5
H'FDEB
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 151 of 1458