![](http://datasheet.mmic.net.cn/30000/M38507F8SP_datasheet_2360444/M38507F8SP_94.png)
Rev.3.01
2003.06.20
page 92 of 98
3850 Group (Spec.A)
Timing requirements
Table 36 Timing requirements (1) (spec. A)
(VCC = 4.0 to 5.5 V, VSS = 0 V, Ta = –20 to 85
°C, unless otherwise noted)
Reset input “L” pulse width
External clock input cycle time
External clock input “H” pulse width
External clock input “L” pulse width
CNTR0, CNTR1 input cycle time
CNTR0, CNTR1 input “H” pulse width
CNTR0, CNTR1 input “L” pulse width
INT0 to INT3 input “H” pulse width
INT0 to INT3 input “L” pulse width
Serial I/O1 clock input cycle time (Note)
Limits
XIN cycle
ns
Parameter
Min.
20
80
32
200
80
800
370
220
100
1000
400
200
Typ.
Max.
Symbol
Unit
Note : When f(XIN) = 8 MHz and bit 6 of address 001A16 is “1” (clock synchronous).
Divide this value by four when f(XIN) = 8 MHz and bit 6 of address 001A16 is “0” (UART).
Serial I/O1 clock input “H” pulse width (Note)
Serial I/O1 clock input “L” pulse width (Note)
Serial I/O1 input setup time
Serial I/O1 input hold time
Serial I/O2 clock input cycle time
Serial I/O2 clock input “H” pulse width
Serial I/O2 clock input “L” pulse width
Serial I/O2 clock input setup time
Serial I/O2 clock input hold time
Table 37 Timing requirements (2) (spec. A)
(VCC = 2.7 to 5.5 V, VSS = 0 V, Ta = –20 to 85
°C, unless otherwise noted)
tW(RESET)
tC(XIN)
tWH(XIN)
tWL(XIN)
tC(CNTR)
tWH(CNTR)
tWL(CNTR)
tWH(INT)
tWL(INT)
tC(SCLK1)
tWH(SCLK1)
tWL(SCLK1)
tsu(RxD-SCLK1)
th(SCLK1-RxD)
tC(SCLK2)
tWH(SCLK2)
tWL(SCLK2)
tsu(SIN2-SCLK2)
th(SCLK2-SIN2)
Reset input “L” pulse width
External clock input cycle time
External clock input “H” pulse width
External clock input “L” pulse width
CNTR0, CNTR1 input cycle time
CNTR0, CNTR1 input “H” pulse width
CNTR0, CNTR1 input “L” pulse width
INT0 to INT3 input “H” pulse width
INT0 to INT3 input “L” pulse width
Serial I/O1 clock input cycle time (Note)
Serial I/O1 clock input “H” pulse width (Note)
Serial I/O1 clock input “L” pulse width (Note)
Serial I/O1 input setup time
Serial I/O1 input hold time
Serial I/O2 clock input cycle time
Serial I/O2 clock input “H” pulse width
Serial I/O2 clock input “L” pulse width
Serial I/O2 clock input setup time
Serial I/O2 clock input hold time
tW(RESET)
tC(XIN)
tWH(XIN)
tWL(XIN)
tC(CNTR)
tWH(CNTR)
tWL(CNTR)
tWH(INT)
tWL(INT)
tC(SCLK1)
tWH(SCLK1)
tWL(SCLK1)
tsu(RxD-SCLK1)
th(SCLK1-RxD)
tC(SCLK2)
tWH(SCLK2)
tWL(SCLK2)
tsu(SIN2-SCLK2)
th(SCLK2-SIN2)
Limits
XIN cycle
ns
Parameter
Min.
20
166
66
500
230
2000
950
400
200
2000
950
400
300
Typ.
Max.
Symbol
Unit
Note : When f(XIN) = 4 MHz and bit 6 of address 001A16 is “1” (clock synchronous).
Divide this value by four when f(XIN) = 4 MHz and bit 6 of address 001A16 is “0” (UART).