UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 272

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(2) Measuring the pulse width by using one input signal of the TI000 pin (free-running timer mode)
272
Capture trigger input
Capture trigger input
(TMC003, TMC002)
Set the free-running timer mode (TMC003 and TMC002 = 01). The count value of TM00 is captured to CR000 in
the phase reverse to the valid edge detected on the TI000 pin. When the valid edge of the TI000 pin is detected,
the count value of TM00 is captured to CR010.
By this measurement method, values are stored in separate capture registers when a width from one edge to
another is measured. Therefore, the capture values do not have to be saved. By subtracting the value of one
capture register from that of another, a high-level width, low-level width, and cycle are calculated.
If an overflow occurs, the value becomes negative if one captured value is simply subtracted from another and,
therefore, a borrow occurs (bit 0 (CY) of the program status word (PSW) is set to 1). If this happens, ignore CY
and take the calculated value as the pulse width. In addition, clear bit 0 (OVF00) of 16-bit timer mode control
register 00 (TMC00) to 0.
Capture interrupt
Capture interrupt
Capture register
Capture register
TM00 register
Operable bits
Overflow flag
(INTTM010)
(INTTM000)
(OVF00)
(CR000)
(CR010)
FFFFH
(TI000)
(TI010)
0000H
0000H
L
L
Figure 6-49. Timing Example of Pulse Width Measurement (2)
00
0000H
A
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
01
TMC00 = 04H, PRM00 = 10H, CRC00 = 07H
M
Preliminary User’s Manual U19111EJ2V1UD
A
B
M
0 write clear
N
B
N
C
0 write clear
S
C
D
S
0 write clear
P
D
P
E
0 write clear
Q
E
Q