UPD78F1502AGK-GAK-AX Datasheet, PDF (794/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 21 STANDBY FUNCTION
Table 21-1. Operating Statuses in HALT Mode (2/3)
HALT Mode Setting
When HALT Instruction Is Executed While CPU Is Operating on Subsystem Clock
Item
When CPU Is Operating on XT1 Clock (fXT)
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)
Operable
Real-time counter (RTC)
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
Operable
Operational amplifier
Voltage reference
Serial array unit (SAU)
Serial interface (IICA)
Cannot operate
LCD controller/driver
Operable
Multiplier/divider
DMA controller
Power-on-clear function
Low-voltage detection function
External interrupt
Key interrupt
Remarks 1.
2.
fIH: Internal high-speed oscillation clock, fIH20:
fX: X1 oscillation clock,
fEX:
fXT: XT1 oscillation clock,
fIL:
The functions mounted depend on the product.
Functions.
20 MHz internal high-speed oscillation clock
External main system clock
Internal low-speed oscillation clock
Refer to 1.4 Block Diagram and 1.5 Outline of
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011