HD6432670 Hitachi, HD6432670 Datasheet - Page 835

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Bit
5
4
3
2
1
0
Bit Name
—
—
STS3
STS2
STS1
STS0
Initial Value
0
0
1
1
1
1
R/W
—
—
R/W
R/W
R/W
R/W
Description
Reserved
These bits are always read as 0. The initial value
should not be changed.
Standby Timer Select 3 to 0
These bits select the time the MCU waits for the
clock to stabilize when software standby mode is
cleared by an external interrupt. With crystal
oscillation, refer to table 22.2 and make a selection
according to the operating frequency so that the
standby time is at least the oscillation stabilization
time. With an external clock, a PLL circuit
stabilization time is necessary. Refer to table 22.2
to set the wait time. When DRAM is used and self-
refreshing in the software standby state is selected,
note that the DRAM’s tRAS (self-refresh RAS pulse
width) specification must be satisfied.
With the F-ZTAT version, a flash memory
stabilization time must be provided.
0000: Setting prohibited
0001: Setting prohibited
0010: Setting prohibited
0011: Setting prohibited
0100: Setting prohibited
0101: Standby time = 64 states
0110: Standby time = 512 states
0111: Standby time = 1024 states
1000: Standby time = 2048 states
1001: Standby time = 4096 states
1010: Standby time = 16384 states
1011: Standby time = 32768 states
1100: Standby time = 65536 states
1101: Standby time = 131072 states
1110: Standby time = 262144 states
1111: Standby time = 524288 states
Rev. 2.0, 04/02, page 789 of 906