CHAPTER 10 SERIAL INTERFACE FUNCTION
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10.3.7 Transmission and reception by CSI0 to CSI3
If both transmission and reception by clocked serial interface mode register n (CSIMn) are enabled, transmit and
receive operations can be carried out simultaneously (n = 0 to 3).
(1) Starting transmit and receive operations
When both the CTXEn bit and CRXEn bit of clocked serial interface mode register n (CSIMn) are set (1), both
transmit operations and receive operations can be performed simultaneously (transmit/receive operations).
Transmit and receive operations are started when both the CTXEn and CRXEn bits of the CSIMn register are
set to 1, enabling transmission and reception and when transmit data is written to shift register n (SIOn).
If the CRXEn bit of the CSIMn register is 1, even if data is written again, a transmit/receive operation is not
started.
(2) Transmitting data in synchronization with the serial clock
(a) If the internal clock is selected as the serial clock
When transmission/reception is started, the serial clock is output from the SCKn pin and at the same time,
data from the SIOn register is output sequentially to the SOn pin in synchronization with the fall of the
serial clock. Also, data from the SIn pin is fetched sequentially to the SIOn register in synchronization
with the rise of the serial clock.
(b) If an external clock is selected as the serial clock
When transmission/reception is started, data from the SIOn register is output sequentially to the SOn pin
in synchronization with the fall of the serial clock input to the SCKn pin after transmission/reception starts.
Also, data from the SIn pin is fetched sequentially to the SIOn register in synchronization with the rise of
the serial clock. When transmission/reception is not started, even if the serial clock is input to the SCKn
pin, shift operations are not performed and the output level of the SOn pin does not change.
Summary of Contents for V850E/MS1 UPD703100
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