
R01UH0336EJ0102 Rev.1.02
Page 1250 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
22.6.4
Consecutive Two-Frame Transfer Mode
Consecutive two-frame transfer mode allows the reception or transmission of
two consecutive frames. The format in this case is as follows.
(a)
Format for consecutive two-frame transfer
Caution
In the consecutive two-frame transfer, the transmit data register is only
accessible in 16-bit units (URTHnTXHL,URTHnRXHL). Do not write to this
register in 8-bit units.
(b)
Timing of consecutive two-frame transmission
(when URTHnCTL1.URTHnSLIT = 0)
Caution
In the consecutive two-frame transfer, the transmit data register is only
accessible in 16-bit units. Do not write to this register in 8-bit units.
D8 D9 D10 D11 D12 D13 D14 D15
SP ST
ST
D0 D1 D2 D3 D4 D5 D6 D7
P
P
SP
Higher-order frame
D15 D14 D13 D12 D11 D10 D9 D8
SP ST
ST
D7 D6 D5 D4 D3 D2 D1 D0
P
P
SP
Higher-order frame
Lower-order frame
Lower-order frame
Format of consecutive two-frame transfer, LSB first:
Format of consecutive two-frame transfer, MSB first:
ST:
Start bit
P:
Parity bit
SP:
Stop bit
D0 to D15: Character bits
D1
D2
D3
D4
D4
D1
D2
D3
D4
D5
D5
D6
D2
URTHnTIT interrupt
URTHnTXHL register
Sub buffer
Note
*
A transmission enable interrupt is generated if the transmit data register is empty.
Transmission
shift register
Frame transmission
*
*
*
D1D2
D3D4
D5D6