AM6548, AM6528, AM6526
ZHCSLA7B –DECEMBER 2019 –REVISED JUNE 2021
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7.9.3.3 Clock Timing
Tables and figures provided in this section define timing requirements and switching characteristics for clock
signals.
表7-12. Clock Timing Requirements
see 图7-12
NO.
MIN
18.52
MAX UNIT
CLK1 tc(EXT_REFCLK1)
CLK2 tw(EXT_REFCLK1H)
CLK3 tw(EXT_REFCLK1L)
CLK13 tc(MCU_EXT_REFCLK0)
CLK14 tw(MCU_EXT_REFCLK0H)
CLK15 tw(MCU_EXT_REFCLK0L)
Cycle time, EXT_REFCLK1
ns
Pulse Duration, EXT_REFCLK1 high
Pulse Duration, EXT_REFCLK1 low
Cycle time, MCU_EXT_REFCLK0
Pulse Duration, MCU_EXT_REFCLK0 high
Pulse Duration, MCU_EXT_REFCLK0 low
E*0.45(1)
E*0.45(1)
18.52
E*0.55(1)
ns
ns
ns
ns
ns
E*0.55(1)
F*0.45(2)
F*0.45(2)
F*0.55(2)
F*0.55(2)
(1) E = EXT_REFCLK1 cycle time.
(2) F = MCU_EXT_REFCLK0 cycle time.
图7-12. Clock Timing Requirements
表7-13. Clock Switching Characteristics
see 图7-13
NO.
PARAMETER
MIN
6
MAX UNIT
CLK4 tc(SYSCLKOUT0)
CLK5 tw(SYSCLKOUT0H)
CLK6 tw(SYSCLKOUT0L)
CLK7 tc(OBSCLK0)
Cycle time minimum,SYSCLKOUT0
Pulse Duration minimum, SYSCLKOUT0 high
Pulse Duration minimum, SYSCLKOUT0 low
Cycle time minimum, OBSCLK0
ns
A*0.4(1)
A*0.4(1)
5
A*0.6(1)
ns
ns
ns
ns
ns
ns
ns
ns
ns
A*0.6(1)
CLK8 tw(OBSCLK0H)
CLK9 tw(OBSCLK0L)
CLK10 tc(CLKOUT0)
Pulse Duration minimum, OBSCLK0 high
Pulse Duration minimum,OBSCLK0 low
Cycle time minimum, MCU_CLKOUT0
Pulse Duration minimum, MCU_CLKOUT0 high
Pulse Duration minimum,MCU_CLKOUT0 low
Cycle time minimum,MCU_SYSCLKOUT0
B*0.45(2)
B*0.45(2)
20
B*0.55(2)
B*0.55(2)
40
CLK11 tw(CLKOUT0H)
CLK12 tw(CLKOUT0L)
CLK16 tc(MCU_SYSCLKOUT0)
C*0.4(3)
C*0.4(3)
6
C*0.6(3)
C*0.6(3)
Pulse Duration minimum, MCU_SYSCLKOUT0
high
CLK17 tw(MCU_SYSCLKOUT0H)
A*0.4(1)
A*0.6(1)
A*0.6(1)
ns
CLK18 tw(MCU_SYSCLKOUT0L)
CLK19 tc(MCU_OBSCLK0)
CLK20 tw(MCU_OBSCLK0H)
CLK21 tw(MCU_OBSCLK0L)
Pulse Duration minimum, MCU_SYSCLKOUT0 low
Cycle time minimum, MCU_OBSCLK0
A*0.4(1)
5
ns
ns
ns
ns
Pulse Duration minimum, MCU_OBSCLK0 high
Pulse Duration minimum,MCU_OBSCLK0 low
B*0.45(2)
B*0.45(2)
B*0.55(2)
B*0.55(2)
(1) A = SYSCLKOUT0 cycle time in MAIN domain; A = MCU_SYSCLKOUT0 in MCU domain.
(2) B = OBSCLK0 cycle time in MAIN domain; B = MCU_OBSCLK0 in MCU domain.
(3) C = MCU_CLKOUT0 cycle time.
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