3823 Datasheet, PDF (70/76 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

3823 Group
Table 24 Switching characteristics (1)
(VCC = 4.0 to 5.5 V, VSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
Parameter
twH(SCLK)
twL(SCLK)
td(SCLK–TXD)
tv(SCLK–TXD)
tr(SCLK)
tf(SCLK)
Serial I/O clock output “H” pulse width
Serial I/O clock output “L” pulse width
Serial I/O output delay time (Note)
Serial I/O output valid time (Note)
Serial I/O clock output rising time
Serial I/O clock output falling time
Limits
Min.
Typ.
tC (SCLK)/2–30
tC (SCLK)/2–30
–30
Note : When the P45/TXD P-channel output disable bit of the UART control register (bit 4 of address 001B16) is “0”.
Unit
Max.
ns
ns
140
ns
ns
30
ns
30
ns
Table 25 Switching characteristics (2)
(VCC = 1.8 to 4.0 V, VSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
Parameter
twH(SCLK)
twL(SCLK)
td(SCLK–TXD)
tv(SCLK–TXD)
tr(SCLK)
tf(SCLK)
Serial I/O clock output “H” pulse width
Serial I/O clock output “L” pulse width
Serial I/O output delay time (Note)
Serial I/O output valid time (Note)
Serial I/O clock output rising time
Serial I/O clock output falling time
Limits
Min.
Typ.
tC (SCLK)/2–100
tC (SCLK)/2–100
–30
Note : When the P45/TXD P-channel output disable bit of the UART control register (bit 4 of address 001B16) is “0”.
Unit
Max.
ns
ns
350
ns
ns
100
ns
100
ns
Measurement output pin
100 pF
CMOS output
Fig. 69 Circuit for measuring output switching characteristics
Measurement output pin
1 kΩ
100 pF
N-channel open-drain output (Note)
Note: When bit 4 of the UART control register
(address 001B16) is “1”. (N-channel open-
drain output mode)
Rev.2.02 Jun 19, 2007 page 70 of 73
REJ03B0146-0202