UPD78F1502AGK-GAK-AX Datasheet, PDF (485/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
14.4 Operation stop mode
Each serial interface of serial array unit has the operation stop mode.
In this mode, serial communication cannot be executed, thus reducing the power consumption.
In addition, the P10/SCK20/SCL20, P11/SI20/SDA20/RxD2/INTP6, P12/SO20/TxD2/TO02, P13/SO10/TxD1/TO04,
P14/SI10/SDA10/RxD1/INTP4, P15/SCK10/SCL10/INTP7, P50/RxD3/SEGx (78K0R/LF3: x = 30, 78K0R/LG3: x = 39,
78K0R/LH3: x = 53), P51/TxD3/SEGx (78K0R/LF3: x = 29, 78K0R/LG3: x = 38, 78K0R/LH3: x = 52), P75/SCK01/KR5,
P76/SI01/KR6, P77/SO01/KR7, P80/SCK00/INTP11, P81/SI00/RxD0/INTP9, and P82/SO00/TxD0 pins can be used as
ordinary port pins in this mode.
14.4.1 Stopping the operation by units
The stopping of the operation by units is set by using peripheral enable register 0 (PER0).
PER0 is used to enable or disable use of each peripheral hardware macro. Clock supply to a hardware macro that is
not used is stopped in order to reduce the power consumption and noise.
To stop the operation of serial array unit 0, set bit 2 (SAU0EN) to 0.
To stop the operation of serial array unit 1, set bit 3 (SAU1EN) to 0.
Figure 14-22. Peripheral Enable Register 0 (PER0) Setting When Stopping the Operation by Units
(a) Peripheral enable register 0 (PER0) … Set only the bit of SAUm to be stopped to 0.
7
6
5
4
3
2
1
0
PER0
RTCEN
×
DACEN
×
ADCEN
×
IIC0EN
×
SAU1EN
0/1
Control of SAUm input clock
0: Stops supply of input clock
1: Supplies input clock
SAU0EN
0/1
TAU1EN
×
TAU0EN
×
Caution
If SAUmEN = 0, writing to a control register of serial array unit m is ignored, and, even if the
register is read, only the default value is read (except for input switch control register (ISC), noise
filter enable register (NFEN0), port input mode registers (PIM1, PIM7), port output mode registers
(POM1, POM7, POM8), port mode registers (PM1, PM5, PM7, PM8), and port registers (P1, P5, P7,
P8)).
Remark
m: Unit number (m = 0, 1)
×: Bits not used with serial array units (depending on the settings of other peripheral functions)
0/1: Set to 0 or 1 depending on the usage of the user
R01UH0004EJ0501 Rev.5.01
469
Jun 20, 2011