UPD78F9222CS-CAC-A Renesas Electronics America, UPD78F9222CS-CAC-A Datasheet - Page 217

• Manufacturer Part Number: UPD78F9222CS-CAC-A
• Description: MCU 8BIT 4KB FLASH 20PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9222CS-CAC-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(2) Generation of serial clock
A serial clock can be generated by using clock selection register 6 (CKSR6) and baud rate generator control
register 6 (BRGC6).
Select the clock to be input to the 8-bit counter by using bits 3 to 0 (TPS63 to TPS60) of CKSR6.
Bits 7 to 0 (MDL67 to MDL60) of BRGC6 can be used to select the division value of the 8-bit counter.
(a) Baud rate
(b) Error of baud rate
The baud rate can be calculated by the following expression.
f
k:
The baud rate error can be calculated by the following expression.
Cautions 1. Keep the baud rate error during transmission to within the permissible error range at
Example: Frequency of base clock = 10 MHz = 10,000,000 Hz
XCLK6
Baud rate =
Error (%) =
: Frequency of base clock selected by TPS63 to TPS60 bits of CKSR6 register
Value set by MDL67 to MDL60 bits of BRGC6 register (k = 8, 9, 10, ..., 255)
2. Make sure that the baud rate error during reception satisfies the range shown in (4)
Set value of MDL67 to MDL60 bits of BRGC6 register = 00100001B (k = 33)
Target baud rate = 153600 bps
Baud rate = 10 M/(2
Error = (151515/153600
f
the reception destination.
Permissible baud rate range during reception.
2
XCLK6
Actual baud rate (baud rate with error)
Desired baud rate (correct baud rate)
= 1.357 [%]
k
[bps]
= 10000000/(2
CHAPTER 11 SERIAL INTERFACE UART6
33)
User’s Manual U16898EJ6V0UD
1)
33) = 151,515 [bps]
100
1
100 [%]
215