HD6432646 Hitachi, HD6432646 Datasheet - Page 770
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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22.2.4
Note: * Only write 0 to clear the flag.
TCSR is an 8-bit read/write register that selects the clock input to WDT1 TCNT and the mode.
Here, we describe bit 4. For details of the other bits in this register, see section 12.2.2, Timer
Control/Status Register (TCSR).
The TCSR is initialized to H'00 at a reset and when in hardware standby mode. It is not initialized
in software standby mode.
Bit 4—Prescaler select (PSS): This bit selects the clock source input to WDT1 TCNT.
It also controls operation when shifting low power dissipation modes. The operating mode
selected after the SLEEP instruction is executed is determined in combination with other control
bits.
For details, see the description for clock selection in section 12.2.2, Timer Control/Status Register
(TCSR), and this section.
Bit 4
PSS
0
1
Note: * Always set high-speed mode when shifting to watch mode or sub-active mode.
736
Bit
Initial value
R/W
Timer Control/Status Register (TCSR)
Description
TCNT counts the divided clock from the ø -based prescaler (PSM).
When the SLEEP instruction is executed in high-speed mode or medium-speed
mode, operation shifts to sleep mode or software standby mode.
TCNT counts the divided clock from the øsubclock-based prescaler (PSS).
When the SLEEP instruction is executed in high-speed mode or medium-speed
mode, operation shifts to sleep mode, watch mode*, or sub-active mode*.
When the SLEEP instruction is executed in sub-active mode, operation shifts to sub-
sleep mode, watch mode, or high-speed mode.
:
:
:
R/(W)*
OVF
7
0
WT/IT
R/W
6
0
TME
R/W
5
0
PSS
R/W
4
0
RST/NMI
R/W
3
0
CKS2
R/W
2
0
CKS1
R/W
1
0
(Initial value)
CKS0
R/W
0
0
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