M37544 Datasheet, PDF (54/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
A/D Converter Characteristics
Table 14 A/D Converter characteristics (VCC = 4.0 to 5.5 V, VSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
Parameter
Test conditions
Limits
Min.
Typ.
Max.
Unit
—
Resolution
8
Bits
ABS
Absolute accuracy
(quantification error excluded)
Ta = –20 to 85 °C, Vcc = VREF
±3
LSB
tCONV
Conversion time
109
tc(XIN)
RLADDER Ladder resistor
37
kΩ
IVREF
Reference power source
VREF = 5.0 V
50
135
200
µA
input current
VREF = 3.0 V
30
80
120
II(AD)
A/D port input current
5.0
µA
Note: As for AD translation accuracy, on the following operating conditions, accuracy may become low.
(1) Since the analog circuit inside a microcomputer becomes sensitive to noise when VREF voltage is set up lower than Vcc voltage,
accuracy may become low rather than the case where VREF voltage and Vcc voltage are set up to the same value..
(2) When VREF voltage is less than [ 3.0V ], the accuracy at the time of low temperature may become extremely low compared with
the time of room temperature. The use beyond VREF=3.0V is recommended in the system the use by the side of low temperature
is assumed to be.
Timing Requirements
Table 15 Timing requirements (VCC = 4.0 to 5.5 V, VSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Symbol
______
tW(RESET)
tC(XIN)
tWH(XIN)
tWL(XIN)
tC(CNTR0)
tWH(CNTR0)
tWL(CNTR0)
tC(CNTR1)
tWH(CNTR1)
tWL(CNTR1)
tC(SCLK)
tWH(SCLK)
tWL(SCLK)
tsu(RxD–SCLK)
th(SCLK–RxD)
Parameter
Reset input “L” pulse width
External clock input cycle time
External clock input “H” pulse width
External clock input “L” pulse width
CNTR0 input cycle time
CNTR0, INT0, INT1, input “H” pulse width
CNTR0, INT0, INT1, input “L” pulse width
CNTR1 input cycle time
CNTR1 input “H” pulse width
CNTR1 input “L” pulse width
Serial I/O clock input cycle time (Note)
Serial I/O clock input “H” pulse width (Note)
Serial I/O clock input “L” pulse width (Note)
Serial I/O input set up time
Serial I/O input hold time
Min.
2
125
50
50
200
80
80
2000
800
800
800
370
370
220
100
Limits
Typ.
Unit
Max.
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note: In this time, bit 6 of the serial I/O control register (address 001A16) is set to “1” (clock synchronous serial I/O is selected).
When bit 6 of the serial I/O control register is “0” (clock asynchronous serial I/O is selected), the rating values are divided by 4.
Rev.1.04 2004.06.08 page 54 of 66
REJ03B0012-0104Z