Renesas RL78/G10

RL78/G10 CHAPTER 5 CLOCK GENERATOR
R01UH0384EJ0311 Rev. 3.11 76
Dec 22, 2016
(2) Low Speed On-chip Oscillator clock
This circuit oscillates a clock of f
IL = 15 kHz (typ.).
The low speed on-chip oscillator clock cannot be used as the CPU clock.
Only the following peripheral hardware runs on the low speed on-chip oscillator clock.
• Watchdog timer
• 12-bit Interval timer
Note
This clock operates when bit 4 (WDTON) of the option byte (000C0H), bit 4 (WUTMMCK0) of the operation
speed mode control register (OSMC)
Note
, or both are set to 1.
However, when WDTON = 1, WUTMMCK0 = 0, and bit 0 (WDSTBYON) of the option byte (000C0H) is 0,
oscillation of the LOCO stops if the HALT or STOP instruction is executed.
Note 16-pin products only.
Remark f
X: X1 clock oscillation frequency
f
IH: High-speed on-chip oscillator clock frequency
f
IL: Low speed on-chip oscillator clock frequency
5.2 Configuration of Clock Generator
The clock generator includes the following hardware.
Table 5-1. Configuration of Clock Generator
Item Configuration
10-pin products 16-pin products
Control registers Clock operation mode control register (CMC)
− √
System clock control register (CKC)
− √
Clock operation status control register (CSC)
− √
Oscillation stabilization time counter status register (OSTC)
− √
Oscillation stabilization time select register (OSTS)
− √
Peripheral enable register 0 (PER0)
√ √
Operation speed mode control register (OSMC)
− √
High-speed on-chip oscillator frequency selection register (HOCODIV)
√ √
Oscillators X1 oscillator
− √
High-speed on-chip oscillator
√ √
Low-speed on-chip oscillator
√ √
Remark √: Provided, −: Not provided