UPD78F1174AGF-GAT-AX Renesas Electronics America, UPD78F1174AGF-GAT-AX Datasheet - Page 288

• Manufacturer Part Number: UPD78F1174AGF-GAT-AX
• Description: MCU 16BIT 78K0R/KX3 128-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Kx3r

Specifications of UPD78F1174AGF-GAT-AX

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, EBI/EMI, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 111
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

7.7 Operation of Timer Array Unit as Independent Channel
7.7.1 Operation as interval timer/square wave output
286
(1) Interval timer
(2) Operation as square wave output
The timer array unit can be used as a reference timer that generates INTTMmn (timer interrupt) at fixed
intervals.
The interrupt generation period can be calculated by the following expression.
A subsystem clock divided by four (f
Consequently, the interval timer can be operated with the count clock fixed to f
frequency (main system clock, subsystem clock). When changing the clock selected as f
value of the system clock control register (CKC)), however, stop the timer array unit m (TAUm) (TT0 = 00FFH,
TT1 = 000FH) first.
TOmn performs a toggle operation as soon as INTTMmn has been generated, and outputs a square wave with
a duty factor of 50%.
The period and frequency for outputting a square wave from TOmn can be calculated by the following
expressions.
TCRmn operates as a down counter in the interval timer mode.
TCRmn loads the value of TDRmn at the first count clock after the channel start trigger bit (TSmn) is set to 1.
If MDmn0 of TMRmn = 0 at this time, INTTMmn is not output and TOmn is not toggled. If MDmn0 of TMRmn =
1, INTTMmn is output and TOmn is toggled.
After that, TCRmn count down in synchronization with the count clock.
When TCRmn = 0000H, INTTMmn is output and TOmn is toggled at the next count clock. At the same time,
TCRmn loads the value of TDRmn again. After that, the same operation is repeated.
TDRmn can be rewritten at any time. The new value of TDRmn becomes valid from the next period.
Remarks 1. m: Unit number (m = 0, 1), n: Channel number (n = 0 to 7),
Generation period of INTTMmn (timer interrupt) = Period of count clock × (Set value of TDRmn + 1)
• Period of square wave output from TOmn = Period of count clock × (Set value of TDRmn + 1) × 2
• Frequency of square wave output from TOmn = Frequency of count clock/{(Set value of TDRmn + 1) × 2}
2. f
mn = 00 to 07, 10 to 13
f
CLK
SUB
: CPU/peripheral hardware clock frequency
: Subsystem clock oscillation frequency
CHAPTER 7 TIMER ARRAY UNIT
SUB
User’s Manual U18432EJ5V0UD
/4) can be selected as the count clock, in addition to CKm0 and CKm1.
SUB
/4, regardless of the f
CLK
(changing the
CLK