SH7032 Datasheet, PDF (141/687 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 8 Bus State Controller (BSC)
Table 8.6 Single-Mode DMA Memory Write Cycle States (External Memory Space)
Single-Mode DMA Memory Write Cycle States
(External Memory Space)
Bits 15–8:
WAIT Pin Input
DWW7–DWW0 Signal
External Memory
Space
Multiplexed
DRAM Space I/O
0
Not sampled
Areas 1, 3–5,7: 1 state, fixed Column address 4 states +
during single-mode
DMA memory write
cycle*
Areas 0, 2,
wait state
6:
1
state
+
long
cycle: 1 state,
fixed (short
pitch)
wait state
from WAIT
1
Sampled during Areas 1, 3–5, 7: 2 states
single-mode DMA + wait state from WAIT
memory write
(Initial value)
cycle
Areas 0, 2, 6: 1 state + long
wait state + wait state from
WAIT
Note: * Sampled in the address/data multiplexed I/O space.
Column address
cycle: 2 states +
wait state from
WAIT (long
pitch)
8.2.4 Wait State Control Register 3 (WCR3)
Wait state control register 3 is a 16-bit read/write register that controls WAIT pin pull-up and the
insertion of long wait states. WCR3 is initialized to H'F800 by a power-on reset. It is not
initialized by a manual reset or in standby mode.
Bit
Initial value
Read/Write
15
14
13
12
11
10
9
8
WPU A02LW1 A02LW0 A6LW1 A6LW0 —
—
—
1
1
1
1
1
0
0
0
R/W
R/W
R/W
R/W
R/W
—
—
—
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
0
0
0
0
0
0
0
0
—
—
—
—
—
—
—
—
Bit 15—Wait Pin Pull-Up Control (WPU): WPU controls whether the WAIT pin is pulled up or
not. When cleared to 0, the pin is not pulled up; when set to 1, it is pulled up.
Bit 15: WPU
0
1
Description
WAIT pin is not pulled up
WAIT pin is pulled up
(Initial value)
Rev. 7.00 Jan 31, 2006 page 115 of 658
REJ09B0272-0700