Datasheet
RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0330EJ0200 Rev.2.00 404
Dec 13, 2013
12.3.14 Serial standby control register m (SSCm)
The SSCm register is used to control the startup of reception (the SNOOZE mode) while in the STOP mode when
receiving CSI00 or UART0 serial data.
The SSCm register can be set by a 16-bit memory manipulation instruction.
The lower 8 bits of the SSCm register can be set with an 8-bit memory manipulation instruction with SSCmL.
Reset signal generation clears the SSCm register to 0000H.
Caution The maximum transfer rate in the SNOOZE mode is as follows.
• When using CSI00 : Up to 1 Mbps
• When using UART0 : 4800 bps only
Figure 12-17. Format of Serial Standby Control Register m (SSCm)
Address: F0138H After reset: 0000H R/W
Symbol 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SSCm 0 0 0 0 0 0 0 0 0 0 0 0 0 0
SS
ECm
SWC
m
SS
ECm
Selection of whether to enable or disable the generation of transfer end interrupt
0 Enable the generation of error interrupts (INTSRE0/INTSRE2).
1 Disable the generation of error interrupts (INTSRE0/INTSRE2).
• The SSECm bit can be set to 1 or 0 only when both the SWCm and EOCmn bits are set to 1 during UART
reception in the SNOOZE mode. In other cases, clear the SSECm bit to 0.
• Setting SSECm, SWCm = 1, 0 is prohibited.
SWC
m
Setting of the SNOOZE mode
0 Do not use the SNOOZE mode function.
1 Use the SNOOZE mode function.
• When there is a hardware trigger signal in the STOP mode, the STOP mode is exited, and A/D conversion is
performed without operating the CPU (the SNOOZE mode).
• The SNOOZE mode function can only be specified when the high-speed on-chip oscillator clock is selected for the
CPU/peripheral hardware clock (f
CLK). If any other clock is selected, specifying this mode is prohibited.
• Even when using SNOOZE mode, be sure to set the SWCm bit to 0 in normal operation mode and change it to 1
just before shifting to STOP mode.
Also, be sure to change the SWCm bit to 0 after returning from STOP mode to normal operation mode.
Caution Setting SSECm, SWCm = 1, 0 is prohibited.
Remark m: Unit number (m = 0)
<R>
<R>