NEC - page 411

411
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
(b) Automatic data transmit/receive control register (ADTC)
ADTC is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ADTC to 00H.
Notes 1. Bits 3 and 4 (TRF and ERR) are Read-Only bits.
2. The termination of automatic transmission/reception should be discriminated by using TRF, not
CSIIF1 (Interrupt request flag).
Caution When an external clock input is selected with bit 1 (CSIM11) of the serial operating mode
register 1 (CSIM1) set to 0, set STRB and BUSY1 of ADTC to 0, 0 (handshake control
cannot be executed when the external clock is input).
Remark ×: Don't care
<6> <5> <4> <3> <2> <1> <0><7>
Symbol
ADTC RE ARLD ERCE ERR TRF STRB BUSY1 BUSY0 FF69H 00H R/WNote 1
Address After Reset R/W
BUSY1
0
1
1
Busy Input Control
Not using busy input
Busy input enable (active high)
Busy input enable (active low)
BUSY0
×
0
1
STRB
0
1
Strobe Output Control
Strobe output disable
Strobe output enable
TRF
1
Status of Automatic Transmit/Receive FunctionNote 2
Detection of termination of automatic transmission/
reception (This bit is set to 0 upon suspension of
automatic transmission/reception or when ARLD = 0.)
During automatic transmission/reception
(This bit is set to 1 when data is written to SIO1.)
R/W
R/W
R
RERR
0
1
Error Detection of Automatic Transmit/Receive
Function
No error
(This bit is set to 0 when data is written to SIO1)
Error occurred
R/W ARLD
0
1
Operating Mode Selection of Automatic Transmit/
Receive Function
Single operating mode
Repetitive operating mode
R/W RE
0
1
Receive Control of Automatic Transmit/Receive
Function
Receive disable
Receive enable
R/W ERCE
0
Error Check Control of Automatic Transmit/
Receive Function
Error check disable
Error check enable (only when BUSY1 = 1)
0
1