HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 147

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

7.2 Wait-State Control Register
The wait-state control register (WCR) is an 8-bit register that specifies the wait mode and the
number of wait states to be inserted. A reset initializes the WCR to specify the programmable
wait mode with three wait states. The WCR is not initialized in the software standby mode.
Bit
Initial value
Read/Write
Bits 7 to 4—Reserved: These bits cannot be modified and are always read as “1.”
Bits 3 and 2—Wait Mode Select 1 and 0 (WMS1 and WMS0): These bits select the wait mode
as shown below.
Bit 3
WMS1
0
0
1
1
Bits 1 and 0—Wait Count (WC1 and WC0): These bits specify the number of wait states to be
inserted.
Wait states are inserted only in bus cycles in which the CPU or DTC accesses an external address.
Bit 1
WC1
0
0
1
1
Bit 2
WMS0
0
1
0
1
Bit 0
WC0
0
1
0
1
—
—
7
1
Description
Programmable wait mode
No wait states are inserted, regardless of the wait count.
Pin wait mode
Pin auto-wait mode
Description
No wait states are inserted, except in pin wait mode.
1 Wait state in inserted.
2 Wait states are inserted.
3 Wait states are inserted. (Initial value)
—
—
6
1
—
—
5
1
129
—
—
4
1
(Initial value)
WMS1
R/W
3
0
WMS0
R/W
2
0
WC1
R/W
1
1
WC0
R/W
0
1