HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 119

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Table 8.5
Bits 15–8:
DWW7–DWW0
0
1
Note: Sampled in the address/data multiplexed I/O space.
8.2.4
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 by the standby mode.
• 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.
Initial value:
Initial value:
Bit name:
Bit name:
Wait State Control Register 3 (WCR3)
Single-Mode DMA Memory Write Cycle States (External Memory Space)
Description
R/W:
R/W:
Bit:
Bit:
WAIT Pin Input
Signal
Not sampled during
single-mode DMA
memory write cycle*
Sampled during
single-mode DMA
memory write cycle
(initial value)
WPU
R/W
15
—
—
1
7
0
A02LW1 A02LW0 A6LW1
R/W
14
—
—
1
6
0
External Memory
Space
Areas 1, 3–5,7: 1 state,
fixed
Areas 0, 2, 6: 1 state +
long wait state
Areas 1, 3–5, 7: 2 states
+ wait state from WAIT
Areas 0, 2, 6: 1 state +
long wait state + wait
state from WAIT
R/W
13
—
—
1
5
0
Single-mode DMA Memory Write Cycle States
R/W
12
—
—
1
4
0
(External Memory Space)
A6LW0
R/W
11
—
—
1
3
0
DRAM Space
Column address
cycle: 1 state,
fixed (short
pitch)
Column address
cycle: 2 states +
wait state from
WAIT (long
pitch)
10
—
—
—
—
0
2
0
—
—
—
—
9
0
1
0
HITACHI 103
Multiplexed
I/O
4 states +
wait state
from WAIT
—
—
—
—
8
0
0
0