HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 74
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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Bits 6 to 4—Standby Timer Select (STS2 to STS0): These bits select the length of time the CPU
and on-chip supporting modules wait for the internal clock oscillator to settle when software
standby mode is exited by an external interrupt. When using a crystal oscillator, set these bits so
that the waiting time will be at least 7 ms at the system clock rate. For further information about
waiting time selection, see section 20.4.3, Selection of Waiting Time for Exit from Software
Standby Mode.
Bit 6
STS2
0
0
0
0
1
1
1
Bit 3—User Bit Enable (UE): Selects whether to use the UI bit in the condition code register as a
user bit or an interrupt mask bit.
Bit 3
UE
0
1
Bit 2—NMI Edge Select (NMIEG): Selects the valid edge of the NMI input.
Bit 2
NMIEG
0
1
Bit 1—Reserved: Read-only bit, always read as 1.
Bit 0—RAM Enable (RAME): Enables or disables the on-chip RAM. The RAME bit is
initialized by the rising edge of the RES signal. It is not initialized in software standby mode.
Bit 0
RAME
0
1
Bit 5
STS1
0
0
1
1
0
0
1
Description
UI bit in CCR is used as an interrupt mask bit
UI bit in CCR is used as a user bit
Description
An interrupt is requested at the falling edge of NMI
An interrupt is requested at the rising edge of NMI
Description
On-chip RAM is disabled
On-chip RAM is enabled
Bit 4
STS0
0
1
0
1
0
1
—
Description
Waiting time = 8,192 states
Waiting time = 16,384 states
Waiting time = 32,768 states
Waiting time = 65,536 states
Waiting time = 131,072 states
Waiting time = 1,024 states
Illegal setting
59
(Initial value)
(Initial value)
(Initial value)
(Initial value)
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