UPD70F3786GJ-GAE-AX Datasheet, PDF (815/1817 Pages) Renesas Technology Corp – RENESAS MCU V850ES/Jx3-E Microcontrollers

V850ES/JH3-E, V850ES/JJ3-E
CHAPTER 17 ASYNCHRONOUS SERIAL INTERFACE C (UARTC)
(8) UARTCn transmit data register L (UCnTXL), UARTCn transmit data register (UCnTX)
The UCnTXL and UCnTX register is an 8-bit or 9-bit register used to set transmit data.
During LSB-first transmission when the data length has been specified as 7 bits, the transmit data is transferred to
bits 6 to 0 of the UCnRX register. During MSB-first transmission, the receive data is transferred to bits 7 to 1 of the
UCnRX register.
The access unit or reset value differs depending on the character length.
• Character length 7/8-bit (UCnOPT1.UCnEBE = 0)
This register can be read or written in 8-bit units.
Reset sets this register to FFH.
• Character length 9-bit (UCnOPT1.UCnEBE = 0)
This register can be read or written in 16-bit units.
Reset sets this register to 01FFH.
Cautions 1. In the transmission operation enable status (UCnPWR = 1 and UCnTXE = 1), Writing to the
UCnTXL, UCnTX register, as operate as trigger of transmission star, if writing the value of as
soon as before and save value, before the INTUCnT interrupt is occurred, the same data is
transferred at twice.
2. Data writing for consecutive transmission, after be generated the INTUCnT interrupt.
If writing the next data before the INTUCnT interrupt is occurred, transmission start
processing and source of conflict writing the UCnTXL, UCnTX register, unexpected
operations may occur.
3. If perform to write the UCnTXL, UCnTXLin the disable transmission operation register, can
not be used as transmission start trigger. Consequently, even if transmission enable
status after perform to write the UCnTXL, UCnTX register in the disable transmission
operation status, can not be started transmission.
(a) Character length 7/8-bit (UCnOPT1.UCnEBE = 0)
After reset: FFH
7
UCnTXL
R/W Address: UC0TXL FFFFFA08H, UC1TXL FFFFFA18H,
UC2TXL FFFFFA28H, UC3TXL FFFFFA38H,
UC4TXL FFFFFA48H, UC5TXL FFFFFA58H,
UC6TXL FFFFFA68H, UC7TXL FFFFFA78H
6
5
4
3
2
1
0
(b) Character length 9-bit (UCnOPT1.UCnEBE = 1)
After reset: 01FFH R/W Address: UC0TX FFFFFA08H, UC1TX FFFFFA18H,
UC2TX FFFFFA28H, UC3TX FFFFFA38H,
UC4TX FFFFFA48H, UC5TX FFFFFA58H,
UC6TX FFFFFA68H, UC7TX FFFFFA78H
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
UCnTX 0 0 0 0 0 0 0
Remark n = 0 to 5 (V850ES/JH3-E)
n = 0 to 7 (V850ES/JJ3-E)
R01UH0290EJ0300 Rev.3.00
Sep 19, 2011
Page 815 of 1817