Datasheet

Analog Integrated Circuit Device Data
125 Freescale Semiconductor
MC34708
Functional Block Description
Table 118. Register 13, Power Control 0
Name Bit # R/W Reset Default Description
PCEN 0 R/W RTCPORB 0x0
Power cut enable
PCCOUNTEN 1 R/W RTCPORB 0x0
Power cut counter enable
WARMEN 2 R/W RTCPORB 0x0
Warm start enable
USEROFFSPI 3 R/W RESETB 0x0
SPI command for entering user off modes
DRM 4 R/W RTCPORB
(76)
0x0
Keeps VSRTC and CLK32KMCU on for all states
USEROFFCLK 5 R/W RTCPORB 0x0
Keeps the CLK32KMCU active during user off
CLK32KMCUEN 6 R/W RTCPORB 0x1
Enables the CLK32KMCU
Unused 8-7 R 0x00
Not available
PCUTEXPB 9 R/W RTCPORB 0x0
PCUTEXPB=1 at a startup event indicates the PCUT timer
did not expire (assuming it was set to 1 after booting)
Unused 18-10 R 0x000
Not available
Reserved 19 R NONE 0x0
Reserved
VCOIN[2:0] 22-20 R/W RTCPORB 0x00
Coin cell charger voltage setting
COINCHEN 23 R/W RTCPORB 0x0
Coin cell charger enable
Notes:
76. Reset by RTCPORB but not during a GLBRST (global reset)
Table 119. Register 14, Power Control 1
Name Bit # R/W Reset Default Description
PCT[7:0] 7-0 R/W RTCPORB 0x00
Power cut timer
PCCOUNT[3:0] 11-8 R/W RTCPORB 0x00
Power cut counter
PCMAXCNT[3:0] 15-12 R/W RTCPORB 0x00
Maximum allowed number of power cuts
Unused 23-16 R 0x00
Not available
Table 120. Register 15, Power Control 2
Name Bit # R/W Reset Default Description
RESTARTEN 0 R/W RTCPORB 0x0
Enables automatic restart after a system reset
PWRON1RSTEN 1 R/W RTCPORB 0x0
Enables system reset on PWRON1 pin
PWRON2RSTEN 2 R/W RTCPORB 0x0
Enables system reset on PWRON2 pin
Unused 3 R 0x0
Not available
PWRON1DBNC[1:0] 5-4 R/W RTCPORB 0x00
Sets debounce time on PWRON1 pin
PWRON2DBNC[1:0] 7-6 R/W RTCPORB 0x00
Sets debounce time on PWRON2 pin
GLBRSTTMR[1:0] 9-8 R/W RTCPORB 0x01
Sets Global reset time
STANDBYINV 10 R/W RTCPORB 0x0
If set then STANDBY is interpreted as active low
Unused 11 R 0x0
Not available
WDIRESET 12 R/W RESETB 0x0
Enables system reset through WDI
SPIDRV[1:0] 14-13 R/W RTCPORB 0x01
SPI drive strength
Unused 16-15 R 0x00
Not available