p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 144

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
6.2
Table 6.1 summarizes the pins of the bus controller.
Table 6.1
Rev. 1.00 Sep. 21, 2006 Page 106 of 658
REJ09B0310-0100
Symbol
AS
IOS
RD
WR
WAIT
External bus control signals
Input/Output Pins
WAIT
Pin Configuration
I/O
Output
Output
Output
Output
Input
Figure 6.1 Block Diagram of Bus Controller
Function
Strobe signal indicating that address output on the address
bus is enabled (when the IOSE bit in SYSCR is cleared to 0).
I/O select signal (when the IOSE bit in SYSCR is set to 1).
Strobe signal indicating that the external address space is
being read.
Strobe signal indicating that the external address space is
being written and the data bus is enabled.
Wait request signal when accessing the external 3-state
access space.
Bus arbiter
controller
controller
Bus
Wait
WSCR
BCR
CPU bus request signal
DTC bus request signal
CPU bus acknowledge signal
DTC bus acknowledge signal
Internal control signals
Bus mode signal