PD17012_15 Datasheet, PDF (268/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
Table 21-1. Device Operations in Halt Status and Clock Stop Status
Peripheral Hardware
Status
CE Pin = High
CE Pin = Low
Halt
Clock Stop
Halt
Clock Stop
Program counter
Stops at address of
HALT instruction
STOP instruction is
invalid (NOP)
Stops at address of
HALT instruction
Initialized to 0000H
and stops
System register
Retained
Retained
Initialized^Note
Peripheral register
Retained
Retained
Retained
Control register
Retained
Retained
Initialized^Note
Timer
Normal operation
Normal operation
Stops operation
PLL frequency synthesizer Normal operation
Disabled
Disabled
A/D converter
Normal operation
Normal operation
Stops operation
D/A converter
Normal operation
Normal operation
Stops operation
BEEP output
Normal operation
Normal operation
Stops operation
Serial interface
Normal operation
Normal operation
Stops operation
Frequency counter
Normal operation
Normal operation
Stops operation
LCD controller/driver
Normal operation
Normal operation
Stops operation
Key source controller/
decoder
Normal operation
Normal operation
Stops operation
General-purpose I/O port Normal operation
Normal operation
Input port
General-purpose input port Normal operation
Normal operation
Input port
General-purpose output
port
Normal operation
Normal operation
Retained
Note For the values to which these registers are initialized, refer to 5. SYSTEM REGISTER (SYSREG) and 8.
REGISTER FILE (RF).
21.7 Notes on Processing Each Pin in Halt and Clock Stop Status
The halt status is used to reduce the current consumption, when only the watch operates, for example.
The clock stop function is used to reduce the current consumption when only the contents of the data memory
are to be retained.
Therefore, the current consumption must be reduced as much as possible in the halt and clock stop statuses.
At this time, the current consumption may increase depending on the status of each pin, and therefore the
points shown in Table 21-2 must be noted.
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Data Sheet U10101EJ4V0DS