BS2824 Holtek Semiconductor Inc., BS2824 Datasheet - Page 7

• Manufacturer Part Number: BS2824
• Description: Touch Key Mcu
• Manufacturer: Holtek Semiconductor Inc.

Rev. 1.00
PB3/[]/SCOM3
PB2/SCOM2
KEY0~KEY7
PC3/PWM1
VDD, VDD1
PB4/[TC0]
Pin Name
PD0~PD7
PB6~PB7
PF0, PF1
PC4/XT2
PC5/XT1
PB5/[]
CREF
Note:
SCD
PC2
PC6
VSS
I/T: Input type
O/T: Output type
OPT: Optional by configuration option (CO) or register option
CO: Configuration Option
PWR: Power
ST: Schmitt Trigger input
CMOS: CMOS output
NMOS: NMOS output
SP: Special input
SCOM: Software controlled LCD COM
HXT: High frequency crystal oscillator
LXT: Low frequency crystal oscillator
The important point to note here is that the PC0, PC1, PC7 and PE7~PE0 pads will not be bounded to
pins in the 44-pin QFP package.
These 11 pads default to an input state, the designer should set the register PCPU and PEPU to pull
high options. In this way, these 11 internal pads can be pulled up in order to prevent input pin floating
power consumption
Function
SCOM2
SCOM3
PWM1
Keyn
SCD
VDD
PB2
PB3
PFD
PBn
TC0
PBn
PBn
PC2
PC3
PC4
PC5
PC6
PDn
Cref
VSS
XT2
XT1
PFn
INT
SCOMC
SCOMC
CTRL0
CTRL0
CTRL0
CTRL1
PCPU
PCPU
PCPU
PCPU
PCPU
PDPU
PBPU
PBPU
PBPU
PBPU
PBPU
PFPU
OPT
CO
CO
PWR
PWR
SP
SP
I/T
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
CMOS General purpose I/O. Register enabled pull-up.
SCOM Software controlled 1/2 bias LCD COM
CMOS General purpose I/O. Register enabled pull-up.
CMOS PFD output
SCOM Software controlled 1/2 bias LCD COM
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS PWM output
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
CMOS General purpose I/O. Register enabled pull-up.
NMOS Serial communication I/O line with pull-high
LXT
LXT
O/T
7
BS2824/BS2854/BS2868
External Timer 0 clock input
External interrupt input
Low frequency crystal pin
Low frequency crystal pin
Touch Pad Inputs
Touch Key Reference Capacitor
Power supply, VDD1 is touch key power supply
Ground
Touch Key MCU
Description
January 27, 2010