Control Registers - NEC UPD703116 User Manual

7
f /2
XX
6
f /2
XX
5
f /2
XX
4
f /2
XX
3
f /2
XX
2
f /2
XX
BRG3
SCKn
SIn
Remarks 1. n = 0, 1
2. f : Internal system clock
XX

10.4.3 Control registers

(1) Clocked serial interface mode registers 0, 1 (CSIM0, CSIM1)
The CSIMn register controls the CSIn operation (n = 0, 1).
These registers can be read/written in 8-bit or 1-bit units (however, bit 0 is read-only).
Caution Overwriting the TRMDn, CCL, DIRn, CSIT, and AUTO bits of the CSIMn register can be done
only when the CSOTn bit = 0. If these bits are overwritten at any other time, the operation
cannot be guaranteed.
CHAPTER 10 SERIAL INTERFACE FUNCTION
Figure 10-25. Block Diagram of Clocked Serial Interface
Selector
Transmission data control
Initial transmit
buffer register
(SOTBFn/SOTBFLn)
Transmit
buffer register
(SOTBn/SOTBLn)
Shift register
(SIOn/SIOLn)
Receive buffer register
(SIRBn/SIRBLn)
User's Manual U14492EJ5V0UD
Serial clock controller
Clock start/stop control
&
clock phase control
Interrupt
controller
Transmission control
Control signal
SO selection
SO latch
SCKn
INTCSIn
SOn
479