NEC V850ES/KE1+ User Manual page 439

(3) Clocked serial interface receive buffer registers n, nL (SIRBn, SIRBnL)
The SIRBn register is a 16-bit buffer register that stores receive data.
When the receive-only mode is set (CSIM0n.TRMDn bit = 0), the reception operation is started by reading
data from the SIRBn register.
This register is read-only in 16-bit units. When the lower 8 bits are used as the SIRBnL register, this register
is read-only in 8-bit units.
In addition to reset input, this register is also cleared to 0000H by clearing (0) the CSIM0n.CSI0En bit.
Cautions 1. Read the SIRBn register only when a 16-bit data length has been set (CSIM0n.CCLn bit =
1).
Read the SIRBnL register only when an 8-bit data length has been set (CCLn bit = 0).
2. When the single transfer mode has been set (CSIM0n.AUTOn bit = 0), perform a read
operation only in the idle state (CSIM0n.CSOTn bit = 0). If the SIRBn or SIRBnL register
is read during data transfer, the data cannot be guaranteed.
(a) SIRBn register
After reset: 0000H
15 14
SIRBn SIRBn SIRBn
(n = 0, 1) 15 14
(b) SIRBnL register
After reset: 00H
7
SIRBnL SIRBn7
(n = 0, 1)
CHAPTER 15 CLOCKED SERIAL INTERFACE 0 (CSI0)
R Address: SIRB0 FFFFFD02H, SIRB1 FFFFFD12H
13 12 11 10 9
SIRBn SIRBn SIRBn SIRBn SIRBn SIRBn
13 12 11 10 9
R Address: SIRB0L FFFFFD02H, SIRB1L FFFFFD12H
6 5 4
SIRBn6 SIRBn5 SIRBn4
User's Manual U16896EJ2V0UD
8 7 6 5 4 3
SIRBn SIRBn SIRBn SIRBn SIRBn
8 7 6 5 4 3
3 2 1
SIRBn3 SIRBn2 SIRBn1
2 1 0
SIRBn SIRBn SIRBn
2 1 0
0
SIRBn0
439