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R01UH0336EJ0102 Rev.1.02
Page 1247 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
22.6.2
Clock Synchronous Mode
In clock synchronous mode, data are transmitted and received in
synchronization with the synchronizing clock (provided by the master side).
Normal sampling
mode
Data are transmitted (output) on falling edges and received data are sampled
on rising edges of the synchronizing clock.
(a)
Timing of transmission by the master
(b)
Timing of reception by the master
(c)
Timing of transmission by the slave
(d)
Timing of reception by the slave
Delayed sampling
mode
In clock synchronous mode, received data are sampled on falling edges of the
synchronizing clock.
(a)
Examples of operation in delayed sampling mode (master, reception)
D3
D4
D5
D6
D7
Parity
Stop
D1
D2
D0
Start
URTHnSC pin
(output)
URTHnTXD pin
(output)
D0
D1
D2
D3
D4
D5
D7
Parity
D1
D2
D3
D4
D5
D6
D7
Parity
D0
D1
D2
D3
D4
D5
D6
D7
Parity
D6
Stop
D0
Stop
Stop
Start
Start
Start
Internal sampling data
URTHnSC pin
(output)
URTHnTXD pin
(output)
URTHnRXD pin
(input)
D0
D1
D2
D3
D4
D5
D6
D7
Parity
URTHnTXD pin
(output)
URTHnSC pin
(input)
Stop
Start
D0
D1
D2
D3
D4
D5
D7
D0
D1
D2
D3
D4
D5
D7
Parity
Start
Start
Start
Internal sampling data
D6
Parity
Stop
D6
Parity
Stop
Stop
D0
D1
D2
D3
D4
D5
D6
D7
URTHnSC pin
(input)
URTHnTXD pin of master
(output)
URTHnRXD pin of slave
(input)
D0
D2
D3
D4
D5
D6
D7
Parity
Start
Stop
D0
D2
D3
D4
D5
D6
D7
Parity
Internal sampling data
URTHnSC pin
URTHnRXD pin
Start
Stop
D1
D1