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7 ClOCK GeneRaTOR (ClG)
S1C17153 TeChniCal Manual
Seiko epson Corporation
7-13
(Rev. 1.0)
D[1:0]
PCKen[1:0]: PClK enable Bits
Enables or disables clock (PCLK) supply to the internal peripheral modules.
8.10 PCLK Control
Table 7.
PCKen[1:0]
PClK supply
0x3
Enabled (on)
0x2
Setting prohibited
0x1
Setting prohibited
0x0
Disabled (off)
(Default: 0x3)
The PCKEN[1:0] default setting is 0x3, which enables clock supply.
Peripheral modules that use PCLK
• Interrupt controller
• 8-bit timer Ch.0
• SPI Ch.0
• Power generator
• P port & port MUX
• MISC registers
The PCLK supply cannot be disabled if one or more peripheral modules in these list must be oper-
ated. The PCLK supply can be disabled if all the peripheral circuits in these list can be stopped.
Stop the PCLK supply to reduce current consumption if all the peripheral modules listed above are
not required.
Peripheral modules/functions that do not use PCLK
• Real-time clock
• Clock timer
• Watchdog timer
• LCD driver
• Sound generator
• SVD circuit
• 16-bit PWM timer Ch.0
• UART Ch.0
• FOUTA/FOUTB outputs
These peripheral modules/functions can operate even if PCLK is stopped.
note
: Do not set PCKEN[1:0] to 0x2 or 0x1, since doing so will stop the operation of certain periph-
eral modules.
CClK Control Register (ClG_CClK)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
CClK Control
Register
(ClG_CClK)
0x5081
(8 bits)
D7–2
–
reserved
–
–
–
0 when being read.
D1–0
CClKGR[1:0]
CCLK clock gear ratio select
CCLKGR[1:0]
Gear ratio
0x0 R/W
0x3
0x2
0x1
0x0
1/8
1/4
1/2
1/1
D[7:2]
Reserved
D[1:0]
CClKGR[1:0]: CClK Clock Gear Ratio Select Bits
Selects the gear ratio for reducing system clock speed and sets the CCLK clock speed for operating the
S1C17 Core. To reduce current consumption, operate the S1C17 Core using the slowest possible clock
speed.