ZLF645E0Q2032G Maxim Integrated, ZLF645E0Q2032G Datasheet - Page 161

• Manufacturer Part Number: ZLF645E0Q2032G
• Description: 8-bit Microcontrollers - MCU Crimzon Flash Infrared MCU
• Manufacturer: Maxim Integrated

Specifications of ZLF645E0Q2032G

• Core: Z8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 1 KB
• On-chip Adc: No
• Operating Supply Voltage: 2 V to 3.6 V
• Package / Case: QFN-EP-20
• Mounting Style: SMD/SMT
• Interface Type: UART
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Programmable I/os: 5
• Number Of Timers: 2 x 8 bit, 1 x 16 bit
• On-chip Dac: No
• Processor Series: ZLF645
• Program Memory Type: Flash
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2 V

19-4572; Rev 0; 4/09
To configure a Port 3 input pin as an SMR3 event source set the corresponding SMR3 
register bit. By default, a Stop Mode Recovery event occurs when the pin’s state is zero.
After a Port 3 pin is configured as an SMR3 source, any subsequent read from or write to
the P2 register latches the read or written value for reference. A Stop Mode Recovery
event occurs when the pin’s state differs from the last reference value latched. The SMR3
source logic is displayed in
The program can read register bits SMR4[3:2] to determine whether the Port 3 pins trigger
a Stop Mode Recovery on a change from the last read value (SMR4[3:2]=01), or on a
change from the last written value (SMR4[3:2]=10). Software can clear SMR4[3:2] to 00
to restore the default behavior (configured pins trigger when their state is 0).
The SMR3 register is summarized in
After the following example code is executed, a 1 on P30 will wake the part from STOP
mode.
After the following example code is executed when the value of P3 is 00h, a 1 on P30 will
wake the part from STOP mode.
LD SMR3, #%01
LD P3, #%00
NOP
STOP
LD SMR3, #%01
LD R6, P3
NOP
STOP
;Select P30 from SMR3.
;Write 00h to Port 3, so the P30 reference
;value is 0, and a 1 on P30 wakes the part.
;Select P30 for SMR3.
;If a 0 is read from Port 3, the P30 reference
;value is 0, so a 1 on P30 wakes the part.
Figure
47.
Table 69
on page 146.
ZLF645 Series Flash MCUs
Reset/Stop Mode Recovery Status
Product Specification
153