mb91101 Fujitsu Microelectronics, Inc., mb91101 Datasheet - Page 56

• Manufacturer Part Number: mb91101
• Description: 32-bit Risc Microcontroller Cmos
• Manufacturer: Fujitsu Microelectronics, Inc.

56
MB91101/MB91101A
12. Clock Generation (Low-power consumption mechanism)
The clock control block is a module which undertakes the following functions.
• CPU clock generation (including gear function)
• Peripheral clock generation (including gear function)
• Reset generation and cause hold
• Standby function (including hardware standby)
• DMA request prohibit
• PLL (multiplier circuit) embedded
• Block diagram
X0
X1
Internal
interrupt request
Internal reset
CPU hold enable
HST pin
DMA
request
Power on sel
RST pin
Oscillator
circuit
DMA request prohibit
Gear control register (GCR)
PCTR register
Watchdog reset generation
[Gear control block]
[Stop/sleep control block]
[DMA prohibit circuit]
[Reset cause circuit]
[Watchdog control block]
postpone register (WPR)
register (PDRR)
Reset cause register (RSRR)
Timebase timer clear
register (STCR)
Standby control
register (CTBR)
PLL
1/2
Peripheral
CPU gear
gear
control circuit
transition
Status
Timebase timer
postpone register
Watchdog reset
Internal clock
generation
circuit
Count clock
generation
Reset
F/F
CPU clock
Internal bus clock
External bus clock
Peripheral
DMA clock
Internal
peripheral clock
STOP state
SLEEP state
CPU hold request
Internal reset