Z8FS040BSB20EG Zilog, Z8FS040BSB20EG Datasheet - Page 31

• Manufacturer Part Number: Z8FS040BSB20EG
• Description: IC MCU 4KB FLASH IRDA 8SOIC
• Manufacturer: Zilog
• Series: ZMOTION™r

Specifications of Z8FS040BSB20EG

• Applications: Infrared Motion Detection
• Core Processor: eZ8
• Program Memory Type: FLASH (4 kB)
• Controller Series: Z8 Encore! XP®
• Interface: IrDA, UART/USART
• Number Of I /o: 5
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Ram Size: -
• Other names: 269-2512

Address
ANAx Scan Request
PIR ADC Result Value (ePIR_ADC_Result)
PIR ADC Result Value (Bits 0-15)
PS028506-1110
Control
Field
Bit
Analog Channel 0, 1, 3-7 Scan Requested Bits
Set by Application; cleared by PIR engine
These bits allow the user application to request the Engine to perform an A/D conversion on the non-
reserved analog inputs. When requested, the Engine will reconfigure the appropriate I/O pin to a single-
ended, unbuffered input using a 2 Volt reference. It will then take the next sample and store it in the PIR
ADC Result Value Registers and clear all ANAx Scan Request bits. The I/O configuration for the ANAx
pin is not returned to its previous configuration by the Engine. If needed, the user application must do
this.
If multiple request bits are set simultaneously, the Engine will only scan the lowest numbered ADC
channel requested and ignore any other requests. The user application should set one request bit then
poll it to determine when the conversion is complete and the data is ready.
When ADC Scan requests are being serviced by the PIR engine, ADC conversions on the PIR sensor
are suspended. Therefore the user application should be careful not to continuously request ADC
Scan’s. The Process Rate Register in the “Advanced PIR Engine” section can be monitored to ensure
the Engine is receiving enough time to perform its required PIR Sensor ADC scans.
0 = no conversion requested/last conversion completed
1 = perform a conversion on this channel
ADC Scan Request Result Value
Controlled by PIR engine
The PIR ADC Result Value contains the result of the last application requested ADC conversion.
The data format is identical to that given in the Z8 Encore XP Product Specification (PS0228) for
registers ADCD_H and ADCD_L.
Example for requesting an ANA0 Conversion:
Note: Even though the ADC Result Value is a 16 bit register, atomic operations are not required since
the value is only updated at the request of the application.
15
14
o
o
o
Set bit 0 (ANA0 Scan Request) in PIR Status/Control Register 3 (ePIR_SC3)
Wait until the ANA0 Scan Request bit is cleared by the Engine
Read the ADC conversion result from the PIR ADC Result Value register
13
12
10AH
11
10
PRELIMINARY
9
ADC Result Value
8
Read
7
ZMOTION
6
5
TM
Detection and Control Family
4
10BH
Product Specification
3
2
1
26
0