CHAPTER 6 CLOCK GENERATION FUNCTION
User’s Manual U13850EJ4V0UM
167
Table 6-1. Operating Statuses in HALT Mode (2/2)
HALT Mode Setting
When CPU Operates with Main Clock
When CPU Operates with Sub Clock
Item
When Subclock Does
Not Exist
When Subclock Exists
When Main Clock’s
Oscillation Continues
When Main Clock’s
Oscillation Is Stopped
Port function
Held
External bus interface
Only bus hold function operates
NMI
Operating
INTP0 to INTP3
Operating
INTP4 and INTP5
Operating
Stopped
External
interrupt
request
INTP6
Operating
Operation when
sampling clock f
XT
is
selected
Key return function
Operating
AD0 to AD15
High impedance
Note
A16 to A21
LBEN, UBEN
Held
Note
(high impedance when HLDAK = 0)
R/W
High level output
Note
(high impedance when HLDAK = 0)
DSTB, WRL,
WRH, RD
ASTB
In external
expansion
mode
HLDAK
Operating
Note
Even when the HALT instruction has been executed, the instruction fetch operation continues until the
on-chip instruction prefetch queue becomes full. Once it is full, operation stops according to the status
shown in Table 6-1.
Содержание MPD703030A
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