UPD78F1502AGK-GAK-AX Datasheet, PDF (795/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 21 STANDBY FUNCTION
Table 21-1. Operating Statuses in HALT Mode (3/3)
HALT Mode Setting
When HALT Instruction Is Executed While CPU Is Operating on Subsystem Clock
Item
When CPU Is Operating on XT1 Clock (fXT) (Subsystem Clock HALT Mode (RTCLPC = 1))
System clock
Clock supply to the CPU is stopped
Main system clock fIH
Status before HALT mode was set is retained
fX
fEX
Operates or stops by external clock input
Subsystem clock fXT
Operation continues (cannot be stopped)
fIL
Set by bits 0 (WDSTBYON) and 4 (WTON) of option byte (000C0H)
• WTON = 0: Stops
• WTON = 1 and WDSTBYON = 1: Oscillates
• WTON = 1 and WDSTBYON = 0: Stops
CPU
Operation stopped
Flash memory
Operation stopped (wait state in low-power consumption mode)
RAM
Status before HALT mode was set is retained at voltage higher than POC detection voltage.
Port (latch)
Status before HALT mode was set is retained
Timer array unit (TAU)
Cannot operate
Real-time counter (RTC)
Operable
Watchdog timer
Set by bits 0 (WDSTBYON) and 4 (WTON) of option byte (000C0H)
• WTON = 0: Stops
• WTON = 1 and WDSTBYON = 1: Operates
• WTON = 1 and WDSTBYON = 0: Stops
Clock output/buzzer output
Operable
A/D converter
Cannot operate
D/A converter
Operational amplifier
Voltage reference
Serial array unit (SAU)
Serial interface (IICA)
LCD controller/driver
Operable
Multiplier/divider
Operation stopped
DMA controller
Power-on-clear function
Operable
Low-voltage detection function
External interrupt
Key interrupt
Remarks 1.
2.
3.
fIH: Internal high-speed oscillation clock, fIH20: 20 MHz internal high-speed oscillation clock
fX: X1 oscillation clock,
fEX: External main system clock
fXT: XT1 oscillation clock,
fIL:
Internal low-speed oscillation clock
RTCLPC: Bit 7 of the operation speed mode control register (OSMC).
The functions mounted depend on the product. Refer to 1.4 Block Diagram and 1.5 Outline of
Functions.
R01UH0004EJ0501 Rev.5.01
779
Jun 20, 2011