ST62T09CM6 STMicroelectronics, ST62T09CM6 Datasheet - Page 55

• Manufacturer Part Number: ST62T09CM6
• Description: Microcontrollers (MCU) OTP EPROM 1K No Intf
• Manufacturer: STMicroelectronics

Specifications of ST62T09CM6

• Processor Series: ST62T0x
• Core: ST6
• Data Bus Width: 8 bit
• Program Memory Type: EPROM
• Program Memory Size: 1 KB
• Data Ram Size: 64 B
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: Details

A/D CONVERTER (Cont’d)
8.3.5 Low Power Modes
Note: The A/D converter may be disabled by clear-
ing the PDS bit. This feature allows reduced power
consumption when no conversion is needed.
8.3.6 Interrupts
Note: The EOC bit is cleared only when a new
conversion is started (it cannot be cleared by writ-
ing 0). To avoid generating further EOC interrupt,
the EAI bit has to be cleared within the ADC inter-
rupt subroutine.
8.3.7 Register Description
A/D CONVERTER CONTROL REGISTER (AD-
CR)
Address: 0D1h - Read/Write (Bit 6 Read Only, Bit
5 Write Only)
Reset value: 0100 0000 (40h)
Bit 7 = EAI Enable A/D Interrupt.
0: ADC interrupt disabled
1: ADC interrupt enabled
Bit 6 = EOC End of conversion. Read Only
When a conversion has been completed, this bit is
set by hardware and an interrupt request is gener-
ated if the EAI bit is set. The EOC bit is automati-
Table 16. ADC Register Map and Reset Values
Interrupt Event
WAIT
STOP
End of Conver-
sion
EAI
Address
Mode
7
(Hex.)
0D0h
0D1h
EOC
No effect on A/D Converter. ADC interrupts
cause the device to exit from Wait mode.
A/D Converter disabled.
ADR
Reset Value
ADCR
Reset Value
STA
Register
Label
Event
EOC
Flag
PDS
Description
Enable
ADCR
EAI
ADR7
Bit
3
EAI
7
0
0
OSC
OFF
from
Wait
Exit
Yes
ADR6
EOC
ADCR
6
0
1
1
from
Stop
Exit
No
ADCR
0
0
ADR5
STA
5
0
0
cally cleared when the STA bit is set. Data in the
data conversion register are valid only when this
bit is set to “1”.
0: Conversion is not complete
1: Conversion can be read from the ADR register
Bit 5 = STA : Start of Conversion. Write Only .
0: No effect
1: Start conversion
Note: Setting this bit automatically clears the EOC
bit. If the bit is set again when a conversion is in
progress, the present conversion is stopped and a
new one will take place. This bit is write only, any
attempt to read it will show a logical zero.
Bit 4 = PDS Power Down Selection.
0: A/D converter is switched off
1: A/D converter is switched on
Bit 3 = ADCR3 Reserved, must be cleared.
Bit 2 = OSCOFF Main Oscillator off.
0: Main Oscillator enabled
1: Main Oscillator disabled
Note: This bit does not apply to the ADC peripher-
al but to the main clock system. Refer to the Clock
System section.
Bits 1:0 = ADCR[1:0] Reserved, must be cleared.
A/D CONVERTER DATA REGISTER (ADR)
Address: 0D0h - Read only
Reset value: xxxx xxxx (xxh)
Bits 7:0 = ADR[7:0] : 8 Bit A/D Conversion Result.
ADR7 ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0
ADR4
7
PDS
4
0
0
ST6208C/ST6209C/ST6210C/ST6220C
ADCR3
ADR3
3
0
0
OSCOFF
ADR2
2
0
0
ADCR1
ADR1
1
0
0
ADCR0
ADR0
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0
0
0
0
1