Renesas rl78 User Manual

RL78/G1A

CHAPTER 6 TIMER ARRAY UNIT

R01UH0305EJ0200 Rev.2.00

197

Jul 04, 2013

6.3.1 Peripheral enable register 0 (PER0)

This registers is used to enable or disable supplying the clock to the peripheral hardware. Clock supply to a hardware

macro that is not used is stopped in order to reduce the power consumption and noise.

When the timer array unit 0 is used, be sure to set bit 0 (TAU0EN) of this register to 1.

The PER0 register can be set by a 1-bit or 8-bit memory manipulation instruction.

Reset signal generation clears this register to 00H.

Figure 6-9. Format of Peripheral Enable Register 0 (PER0)

Address: F00F0H After reset: 00H R/W

Symbol

<7> 6 <5> <4> <3> <2> 1 <0>

PER0 RTCEN 0

ADCEN

IICA0EN

SAU1EN

Note

SAU0EN 0 TAU0EN

TAU0EN

Control of timer array 0 unit input clock

Stops supply of input clock.
• SFR used by the timer array unit 0 cannot be written.
• The timer array unit 0 is in the reset status.

Supplies input clock.
• SFR used by the timer array unit 0 can be read/written.

Notes

32, 48, and 64-pin products only.

Cautions 1. When setting the timer array unit, be sure to set the TAUmEN bit to 1 first. If TAUmEN = 0,

writing to a control register of timer array unit is ignored, and all read values are default

values (except for the timer input select register 0 (TIS0), input switch control register

(ISC), noise filter enable register 1 (NFEN1), port mode control registers 0, 1, 3, 4 (PMC0,

PMC1, PMC3, PMC4), port mode registers 0, 1, 3, 4 (PM0, PM1, PM3, PM4), and port

registers 0, 1, 3, 4 (P0, P1, P3, P4)).

• Timer clock select register m (TPSm)

• Timer mode register mn (TMRmn)

• Timer status register mn (TSRmn)

• Timer channel enable status register m (TEm)

• Timer channel start register m (TSm)

• Timer channel stop register m (TTm)

• Timer output enable register m (TOEm)

• Timer output register m (TOm)

• Timer output level register m (TOLm)

• Timer output mode register m (TOMm)

2. Be sure to clear the following bits to 0.

25-pin products: bits 1, 3, 6

32, 48, 64-pin products: bits 1, 6

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