Pin-Remapping F�Nctions; Pin-Remapping Registers - Holtek HT68F Series Manual

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60
HT68FU30/HT68FU40/HT68FU50/HT68FU60
Enhanced I/O Flash Type 8-Bit MCU with EEPROM
Pin-remapping Functions
The flexibility of the microcontroller range is greatly enhanced by the use of pins that have more
than one function. Limited numbers of pins can force serious design constraints on designers but
by supplying pins with multi-functions, many of these difficulties can be overcome. The way in
which the pin function of each pin is selected is different for each function and a priority order is
established where more than one pin function is selected simultaneously. Additionally there are a
series of PRM0, PRM1 and PRM2 registers to establish certain pin functions.

Pin-remapping Registers

The limited number of supplied pins in a package can impose restrictions on the amount of functions
a certain device can contain. However by allowing the same pins to share several different functions
and providing a means of function selection, a wide range of different functions can be incorporated
into even relatively small package sizes. Some devices include PRM0, PRM1 or PRM2 registers
which can select the functions of certain pins.
Pin-remapping Register List
• HT68F30
Register
Name
7
PRM0 —
• HT68F40
Register
Name
7
PRM0 —
PRM1 TCK2PS
PRM2 —
• HT68F50
Register
Name
7
PRM0 —
PRM1 TCK2PS
PRM2 TP31PS
• HT68F60
Register
Name
7
PRM0 C1XPS1
PRM1 TCK2PS
PRM2 TP31PS
Rev. 2.10
Bit
6 5 4
— — —
Bit
6 5 4
C1XPS0 — C0XPS0
TCK1PS TCK0PS —
— TP21PS TP20PS TP1B2PS TP1APS
Bit
6 5 4
C1XPS0 — C0XPS0
TCK1PS TCK0PS —
TP30PS TP21PS TP20PS TP1B2PS TP1APS
Bit
6 5 4
C1XPS0 C0XPS1 C0XPS0
TCK1PS TCK0PS INT2PS1 INT1PS1 INT1PS0 INT0PS1 INT0PS0
TP30PS TP21PS TP20PS TP1B2PS TP1APS
89
3 2 1
— PCPRM SIMPS0
3 2 1
PDPRM SIMPS1 SIMPS0
INT1PS1 INT1PS0 INT0PS1 INT0PS0
TP01PS
3 2 1
PDPRM SIMPS1 SIMPS0
INT1PS1 INT1PS0 INT0PS1 INT0PS0
TP01PS
3 2 1
PDPRM SIMPS1 SIMPS0
TP01PS
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0
PCKPS
0
PCKPS
TP00PS
0
PCKPS
TP00PS
0
PCKPS
TP00PS