Registers - Fujitsu MB91460 SERIES FR60 User Manual

4. Registers

4.1 STCR: Standby Control Register
Used to control transition to the stop and sleep standby modes, and to specify the pin states and whether to
halt the oscillation during stop mode.
Note: See "Chapter 9 Reset (Page
• STCR: Address 0481h (Access: Byte)
7 6
STOP SLEEP
0 0
0 0
0 0
R/W R/W
(See "Meaning of Bit Attribute Symbols (Page
• Bit7: Stop mode
STOP
0
1
• Goes to "0" when a reset (INIT pin input or software reset) occurs or on recovery from stop mode.
• Going directly from main PLL operation to stop mode is prohibited. (See
• Bit6: Sleep mode
SLEEP
0
1
• If this bit and the stop mode bit (STOP) bit are set to "1" at the same time, the device goes to stop mode.
• Goes to "0" when a reset (INIT pin input or software reset) occurs or on recovery from sleep mode.
• Bit5: High impedance mode
HIZ
0
1
• The default setting is high impedance.
• Bit4: Software reset (SRST)
• Setting this bit to "0" invokes a software reset.
• Bit3-2: Oscillation stabilization time selection (OS[1:0])
• Setting these bits in the range "00"-"11" sets the oscillation stabilization time to use after recovering from
stop mode.
An INIT pin input reset or watchdog reset initialize this setting to its initial value.
(See "Chapter 18 Timebase Counter (Page
• Bit1: Sub clock oscillation halt
OSCD2
0
1
No.139)" also.
5 4 3
HIZ SRST OS1
1 1 0
1 1 X
X 1 X
R/W R1, W R/W
Does not change to stop mode.
Does not change to sleep mode.
Maintain same pin states when changing to stop mode.
Set pin outputs to high impedance (Hi-z) during stop mode.
Operation of sub clock during stop mode
2 1
OS0 OSCD2 OSCD1
0 1
X 1
X X
R/W R/W
No.10)" for details of the attributes.)
Operation
Changes to stop mode.
Operation
Changes to sleep mode.
Operation
No.249)".)
Continue oscillation
Halt oscillation
0 bit
Initial value
1
(INITX pin input)
Initial value
1
(Watchdog reset)
X Initial value (Software reset)
R/W Attribute
"8. Caution (Page
Chapter 10 Standby
4.Registers
No.165)".)
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