ST92F250CV2QB STMicroelectronics, ST92F250CV2QB Datasheet - Page 162

• Manufacturer Part Number: ST92F250CV2QB
• Description: IC MCU 256K FLASH 100-PQFP
• Manufacturer: STMicroelectronics
• Series: ST9r

Specifications of ST92F250CV2QB

• Core Processor: ST9
• Core Size: 8/16-Bit
• Speed: 24MHz
• Connectivity: CAN, I²C, LIN, SCI, SPI
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 100-QFP
• Processor Series: ST92F25x
• Core: ST9
• Data Bus Width: 8 bit, 16 bit
• Data Ram Size: 8 KB
• Interface Type: CAN, I2C, SCI, SPI
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 80
• Number Of Timers: 5 x 16 bit
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST92F150-EPB
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16 bit x 10 bit
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2139

TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont’d)
10.1.5 Register Description
The Timer/Watchdog is associated with 4 registers
mapped into Group F, Page 0 of the Register File.
WDTHR: Timer/Watchdog High Register
WDTLR: Timer/Watchdog Low Register
WDTPR: Timer/Watchdog Prescaler Register
WDTCR: Timer/Watchdog Control Register
Three additional control bits are mapped in the fol-
lowing registers on Page 0:
Watchdog Mode Enable, (WCR.6)
Top Level Interrupt Selection, (EIVR.2)
Interrupt A0 Channel Selection, (EIVR.1)
Note: The registers containing these bits also con-
tain other functions. Only the bits relevant to the
operation of the Timer/Watchdog are shown here.
Counter Register
This 16-bit register (WDTLR, WDTHR) is used to
load the 16-bit counter value. The registers can be
read or written “on the fly”.
TIMER/WATCHDOG HIGH REGISTER (WDTHR)
R248 - Read/Write
Register Page: 0
Reset value: 1111 1111 (FFh)
Bits 7:0 = R[15:8] Counter Most Significant Bits.
TIMER/WATCHDOG LOW REGISTER (WDTLR)
R249 - Read/Write
Register Page: 0
Reset value: 1111 1111b (FFh)
Bits 7:0 = R[7:0] Counter Least Significant Bits.
162/429
9
R15
R7
7
7
R14
R6
R13
R5
R12
R4
R11
R3
R10
R2
R9
R1
R8
R0
0
0
TIMER/WATCHDOG PRESCALER REGISTER
(WDTPR)
R250 - Read/Write
Register Page: 0
Reset value: 1111 1111 (FFh)
Bits 7:0 = PR[7:0] Prescaler value.
A programmable value from 1 (00h) to 256 (FFh).
Warning: In order to prevent incorrect operation of
the Timer/Watchdog, the prescaler (WDTPR) and
counter (WDTRL, WDTRH) registers must be ini-
tialised before starting the Timer/Watchdog. If this
is not done, counting will start with the reset (un-in-
itialised) values.
WATCHDOG TIMER CONTROL REGISTER
(WDTCR)
R251- Read/Write
Register Page: 0
Reset value: 0001 0010 (12h)
Bit 7 = ST_SP: Start/Stop Bit.
This bit is set and cleared by software.
0: Stop counting
1: Start counting (see Warning above)
Bit 6 = S_C: Single/Continuous.
This bit is set and cleared by software.
0: Continuous Mode
1: Single Mode
Bits 5:4 = INMD[1:2]: Input mode selection bits.
These bits select the input mode:
ST_SP
PR7
INMD1
7
7
0
0
1
1
S_C
PR6
INMD2
INMD1
PR5
0
1
0
1
INMD2
PR4
Gated Input (Reset value)
INEN
PR3
Retriggerable Input
Triggerable Input
Event Counter
INPUT MODE
OUTMD
PR2
WROUT
PR1
OUTEN
PR0
0
0